The significance of output in SLA is highlighted in Krashen’s hypothesis.

The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wavelength, is scattered more efficiently than light of longer wavelengths. Although waters of the open ocean are commonly some shade of blue, green water is commonly seen near coasts, especially in tropical or subtropical regions. This is caused by yellow pigments being mixed with blue water. Phytoplankton are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near the shore, silt or sediment in suspension can give water a brownish hue. Outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles.

Marine phytoplankton (Greek for "plant wanderers") are microscopic single-celled plants that include diatoms, dinoflagellates, coccolithophorids, green algae, and blue-green algae, among others. The growth of these organisms, which photosynthesize light, depends on a delicate balance of nutrient enrichment via vertical mixing, which is often limited by the availability of nitrogen and light. Diatoms are one-celled plants with patterned glass coverings. Each glass, or silicon dioxide box, is ornamented with species-specific designs, pits, and perforations making them popular with microscopists and, more recently, electron scanning microscopists.

Green water near coastlines is almost always caused by ______.

A．sand color

B．red pigments in coastal waters

C．blue pigment

D．reflected light and yellow pigment from plant life

The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wavelength, is scattered more efficiently than light of longer wavelengths. Although waters of the open ocean are commonly some shade of blue, green water is commonly seen near coasts, especially in tropical or subtropical regions. This is caused by yellow pigments being mixed with blue water. Phytoplankton are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near the shore, silt or sediment in suspension can give water a brownish hue. Outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles.

Marine phytoplankton (Greek for "plant wanderers") are microscopic single-celled plants that include diatoms, dinoflagellates, coccolithophorids, green algae, and blue-green algae, among others. The growth of these organisms, which photosynthesize light, depends on a delicate balance of nutrient enrichment via vertical mixing, which is often limited by the availability of nitrogen and light. Diatoms are one-celled plants with patterned glass coverings. Each glass, or silicon dioxide box, is ornamented with species-specific designs, pits, and perforations making them popular with microscopists and, more recently, electron scanning microscopists.

Green water near coastlines is almost always caused by ______.

A．sand color

B．red pigments in coastal waters

C．blue pigment

D．reflected light and yellow pigment from plant life

Scientists have long been interested in how the deaf process signed languages in the braia Understanding that activity could shed light to whether the brain contains specialized structures for decoding【M1】______ linguistic patterns in general regardless how they are conveyed. A【M2】______ new study published in Tuesdays issue of Proceedings of the National Academy of Science suggests that the brain does have such wiring, challenged the idea that speech and sound are vital for human【M3】______ language. Laura Ann Petitto and other researchers base their conclusions on a series of experiments which involves 11 profoundly deaf people and 10 hearing people. Earlier work had demonstrated that deaf people were processing signed sentences used mostly their left【M4】______ hemispheres, just as hearing people parsing spoken language. But the【M5】______ new study found that in addition, both groups rely on identical brain structures for similar tasks. The researchers were particularly stunned by this activity in the brain of the deaf. The puzzled finding has led Petitto and Zatorre to propose that【M6】______ perhaps areas of the brain once viewing as devoted to sounds actually【M7】______ contain different types of cells that are capable of responding at the【M8】______ patterns of natural language in any form. "Such neural specialization for aspects of language patterning appears to be neurally modifiable,【M9】______ as languages with radically different sensory modalities such as speech and sign are processed at different brain sites", the authors write,【M10】______ "while, at the same time, the neural pathways for expressing and perceiving natural language appear to be neurally highly modifiable."

【M1】

The light characteristic of composite group flashing(2 + 1)is used in the Aids to Navigation System on the Western Rivers for lights on ().

A.the right descending bank

B.the left descending bank

C.preferred-channel buoys

D.daymarks with no lateral significance

The theory that the impact of a giant meteorite caused the extinction of the dinosaurs is based on evidence that a cloud of dust from the impact blocked off sunlight around the globe for months, reducing temperatures and destroying the dinosaurs food supply. Which of the following, if true, casts the most serious doubt on the theory above?

A．Dinosaurs are believed to have been cold-blooded and thus very sensitive to any temperature change.

B．Some dinosaurs lived in regions where their food supply was not well adapted for long periods of cold and darkness.

C．Many large animals that existed during the time of the dinosaurs and shared a common food supply with them continued to populate the Earth long after the extinction of the dinosaurs.

D．A large volcanic explosion that strewed dust in the air and blocked out sunlight was the cause of death of animals within hundreds of miles of the eruption.

E．Many of the largest dinosaurs were herbivorous relying exclusively on vegetation for their dietary needs.

A summary of the physical and chemical nature of life must begin; not on the Earth, but in the Sun; in fact, at the Sun’s very center. It’s here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is liberated at the center of the Sun as billions upon bil lions of nuclei hydrogen atoms collide with each other and fuse together to form. nuclei of helium, and, in do ing so, release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of years.

The nuclear energy is released at the Sun’s center as high - energy gamma radiation, a form. of electro magnetic radiation like light and radio waves only of very much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to be reemitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and reemitted. At the energy filters through the layers of the solar interior, it passes through the X - ray part of the spectrum, eventually becoming light. At this stage, it has reached what we call the solar sur face, and can escape into space, without being absorbed farther by solar atoms. A very small fraction of the Sun's light ,ma heat is emitted in such directions that, after passing unhindered through interplanetary space, it hits the Earth.

A simple magnifying glass, focusing the Sun’s rays, can scoarch, a piece of wood or set a Scrap of paper on fire. Solar radiation can also be concentrated on a much larger scale. It can burn a hole through thick steel plate, for example, or simulate the thermal shock of a nuclear blast. It can, that is, with the help of a super reflector of the sort that has been set up by French scientists high in the Pyreness. The world’s largest solar furnace is a complex of nearly 20,000 mirrors. It can concentrate enough sunlight to create temperatures in excess of 6000 degrees Fahrenheit.

The furnace’s appearance is as spectacular as its power. Its glittering eight - story - high reflector towers over very old houses. Anchored against a concrete office and laboratory building, the huge reflector consists of nearly 9000 separate mirrors. For the furnace to operate, these small mirrors must be adjusted so that their light will meet exactly at a focal point 59 feet in front of the giant reflector.

What does the passage mainly discuss?

A．The production of solar light and heat.

B．The physical and chemical nature of life.

C．The conversion of Hydrogen to helium.

D．Radiation in the X - ray part of the spectrum.

The bird, however hard the frost may be, flies briskly to his customary roosting-place, and, with beak tucked into his wing, falls asleep. He has no apprehensions; only the hot blood grows colder and colder, the pulse feebler as he sleeps, and at midnight, or in the early morning, he drops from his perch—dead.

Yesterday he lived and moved, responsive to a thousand external influences, reflecting earth and sky in his small brilliant brain as in a looking-glass; also he had a various language, the inherited knowledge of his race, and the faculty of flight, by means of which he could shoot, meteor-like, across the sky, and pass swiftly from place to place; and with it he was able to drop himself plumb down from the tallest tree-lop, or out of the void air, on to a slender spray, and scarcely cause its leaves to tremble.

Now, on this morning, he lies stiff and motionless; so easy and swift is the passage from life to death in wild nature! But he was never miserable.