钢筋混凝土梁带裂缝工作阶段的抗弯刚度不仅与材料的弹性模量、截面尺寸有关，同时随着荷载增大而减小。（)

In the compressed history of Earth the Declaration of Independence is signed ______.

A．a long time before the New Year

B．immediately after the New Year's Day

C．just one second before the New Year

D．right on the New Year's Day

ricted to the sea. Living things began to popular the land slightly over 400 million years ago, and humans have existed for no more than 3 million years.

One way to represent the evolution of life is to compress the 6-billion-year history of Earth into a 1-year-log film. In such a film, earth forms as the film begins on January 1, and through all of January and February it cools and is cratered (变成坑状) and the first oceans form. But those oceans remain lifeless until sometimes in March or early April, when the first living things develop. The 4-million-year history of Precambrian (前寒武纪) evolution lasts until the film reaches mid-November, when primitive ocean life begins to evolve into complex organisms such as trilobites (三叶虫) .

If we examine the land instead of the oceans, we find a lifeless waste. But once our film shows plant and animal life on the land, about November 28, evolution proceeds rapidly. Dinosaurs, for example, appear about December 12 and vanish by Christmas Eve, as mammals (哺乳动物) and birds flourish.

Throughout the 1-year-run of our film there are no humans, and even during the last days of the year as the mammals rise and dominate the landscape, there are no people. In the early evening of December 31, vaguely human forms move through the grasslands, and by late evening they begin making stone tools. The Stone Age lasts until shout 11: 45 pm, and the first signs of civilization, towns and cities, do not appear until 11: 45 pm. The Christian era begins only 14 seconds before the New Year, and the Declaration of Independence is signed with 1 second to spare.

In comparing all of Earth’s geological evolution to one calendar year, the author shows_____________

A.just how recently humanity has arrived on the scene

B.just how simple it is to understand the history of Earth

C.just how early humanity appears on planet Earth

D.just how difficult it is to understand the history of earth

According to the passage, primitive ocean life begins to evolve into complex organisms_____________A.in the middle of December

B.when Earth is cratered

C.at the beginning of November waste

D.when the land is still a lifeless

It is indicated in the passage that_____________A.Earth id cool at first

B.Earth id hot at the beginning

C.There are oceans at the beginning

D.There is life in the ocean in late February

In the one-year-long film dinosaurs_____________A.die out on December 25

B.appear after December 25

C.die out on December 24

D.appear on December 24

In the compressed history of Earth the Declaration of Independence is signed_____________A.a long time before the New Year Year’s Day

B.immediately after the New

C.just one second before the New Year

D.right on the New Year Day

请帮忙给出每个问题的正确答案和分析，谢谢！

Please Listen to the following TED talk and answer the questions followed. (5分29-5分52秒） The speaker then describe the most important conclusion from the physics, first,_____________, and second, _____________.

A、first, from Earth’s energy balance and, second, from Earth’s climate history

B、first, from Earth’s radiation balance and, second, from Earth’s climate history

C、first, from Earth’s energy balance and, second, from Earth’s warming history

D、first, from Earth’s energy balance and, second, from Earth’s changing geographical history

____.

A．just how recently humanity has arrived on the scene

B．just how simple it is to understand the history of Earth

C．just how early humanity appears on planet Earth

D．just how difficult it is to understand the history of Earth

The photosynthesis by ancient microbes is an example of ______.

A．the change of Earth

B．the long history of Earth

C．the life's influences on Earth

D．the power of sunlight

governments, is a landmark in the history of international diplomacy.

A．in behalf of

B．on behalf of

C．represented

D．represent

dings.

A．interaction

B．intersection

C．interference

D．intercourse

estricted to the sea. Living things began to populate the land slightly over 400 million years ago. And humans have existed for no more than 3 million years.

One way to represent the evolution of life is to compress the 4. 6-billion-year history of Earth into a 1-year-long film. In such a film, Earth forms as the film begins on January 1, and through all of January and February it cools and is cratered(变成坑状) and the first oceans form. But those oceans remain lifeless until sometime in March or early April, when the first living things develop. The 4-billion-year history of Precambrian (前寒武纪) evolution lasts until the film reaches mid-November, when primitive ocean life begins to evolve into complex organisms such as trilobites(三叶虫).

If we examine the land instead of the oceans, we find a lifeless waste. But once our film shows plant and animal life on the land, about November 28, evolution proceeds rapidly. Dinosaurs, for example, appear on about December 12 and vanish by Christmas Eve, as mammals (哺乳动物) and birds flourish.

Throughout the 1 -year-run of our film there are no humans, and even during the last days of the year as the mammals rise and dominate the landscape, there are no people. On the early evening of December 31, vaguely human forms move through the grasslands, and by late evening they begin making stone tools. The Stone Age lasts until about 11:45 p. m. , and the first signs of civilization, towns and cities, do not appear until 11:54 p. m. The Christian era begins only 14 seconds before the New Year, and the Declaration of Independence is signed with one second to spare.

In comparing all of Earth's geological evolution to one calendar year, the author shows

A．just how recently humanity has arrived on the scene

B．just how simple it is to understand the history of Earth

C．just how early humanity appears on planet Earth

D．just how difficult it is to understand the history of Earth