The min purpose of this pssge is to ______.introduce the process of presidentil inuThe min

The purpose of the pssge is to ______.introduce the importnce of flgs.B．introduce thThe purpose of the pssge is to ______.introduce the importnce of flgs. B．introduce the history of the US flg. C．introduce the process of designing flg D．introduce the function of ntionl flg

A．introduce the importance of flags．

B．introduce the history of the US flag．

C．introduce the process of designing a flag

D．introduce the function of a national flag

What's the main idea of this passage?

A．Teenager's driving is unsafe and unnecessary.

B．Teenagers were more rebellious in 1970s.

C．Teenage driving decreased because of car insurance, driver's education and parents' love.

D．To make teenagers dependent on parents helps stop them from driving.

What's the main idea of this passage?

A．Teenager's driving is unsafe and unnecessary.

B．Teenagers were more rebellious in 1970s.

C．Teenage driving decreased because of car insurance, driver's education and parents' love.

D．To make teenagers dependent on parents helps stop them from driving.

根据以下内容回答下列各题, The Mother Goose Stories, so well known to children all over the word, are commonly said to have been written by a little old woman for her grandchildren. According to some people, she lived in Boston, and her real name was Elizabeth Vergoose. Her son-in-law, a printer named Thomas Fleet, was supposed to have published the famous stories and poems for small children in 1719. However, no copy of this book has ever been found, and most scholars doubt the truth of this story—and doubt, moreover, that Mother Goose was ever a real person. They point out that the name is a direct translation of the French “Mere I Oye.” In 1697 the Frenchman Charles Perrault published the first book in which this name was used． The collection contains eight tales, including “Sleeping Beauty,” “Cinderella,” and “Puss in Boots.” But Perrault did not originate these stories; they were already quite popular in his day, and he only collected them. What is suppssed to have happened in 1719?

A.Elizabeth Vergoose wrote the first Mother Goose Stories.

B.Thomas Fleet published the Mother Goose Stories.

C.The Mother Goose Stories were translated into French.

D.Charles Perrault published the first Mother Goose Stories.

Have a look at Paragraphs 7 and 8 to see how a statement is supported by examples. Then fill out the chart below.

  Paras. 7&8

  The genetic maps also shed new light on the origins of populations that have long puzzled scientists. Example: the Khoisan people of southern Africa. Many scientists consider the Khoisan a distinct race of very ancient origin. The unique character of the clicking sounds in their language has persuaded some researchers that the Khoisan people are directly descended from the most primitive human ancestors~ But their genes beg to differ. They show that the Khoisan may be a very ancient mix of west Asians and black Africans. A genetic trail visible on the maps shows that the breeding ground for this mixed population probably lies in Ethiopia or the Middle East.

  The most distinctive members of the European branch of the human tree are the Basques of France and Spain. They show unusual patterns for several genes, including the highest rate of a rare blood type. Their language is of unknown origin and cannot be placed within any standard classification. And the fact that they live in a region next to famous caves which contain vivid paintings from Europe's early humans, leads Cavalli-Sforza to the following conclusion: "The Basques are extremely likely to be the most direct relatives of the Cro-Magnon people, among the first modern humans in Europe." All Europeans are thought to be a mixed population, with 65% Asian and 35% African genes.

  A statement: The genetic maps also shed new light on the origins of populations that have long puzzled scientists.

  Example 1:

  Many scientists consider the Khoisan a distinct race of very ancient origin, directly descended from the most primitive human ancestors. But the genetic maps show ______ (Para. 7)

  Example 2:

  The Basques of France and Spain have unusual patterns for several genes and their language of unknown origin cannot be placed within any standard classification. And the fact where they live leads to the conclusion that the Basques are likely to be ______. All Europeans are thought to be a ______. (Para. 8)

A new kind of radar has been developed for space-age travelers. A working laboratory model of a new system of radar that makes use of a beam of light is said to be ten thousand times more accurate than the best comparable system of radar that uses microwaves. The model has shown that this radar system (known as laser-doppler radar) can measure with absolute precision speeds varying from spaceship orbital injection velocities (速度) of five miles per second down to virtual stops—speeds of less than one ten thousandth of an inch per second. According to the scientists who are developing this system, such fine measures of velocity are of prime importance in space missions. In a rendezvous (会合, 会合点) between two spaceships, or in a landing approach by a vehicle onto an orbiting space station, a bump could rip open a ships skin, or a nudge (轻触) could knock the station out of its orbit. The light-beam radar, which operates at a frequency of trillions of cycles per second, could easily detect and measure the movement of a vehicle edging up to a satellite space station even at a small fraction of an inch per second. A control system using so precise a signal as this would allow a huge vehicle to dock at a space station as lightly as a feather.

Laser-doppler radar makes use of______.

A．light

B．microwaves

C．sound waves

D．both A and B