[单项选择]

Passage Three Humanity is a new experiment on planet Earth. For most of its history, life on Earth was restricted 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 tire 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 (前赛武纪) 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 No
A. die out on December 25
B. appear after December 25
C. die out on December 24
D. appear on December 24

最新试题

• ●    ふだん勉強しなかったから、できないのは＿当然のことだ。
• ●    [填空题] 凡具备由安全通道（ ）通过的地点,严禁横越线路。（ ）
• ●    [单选题]钻开油气层后,起钻前要进行短程起下钻作业,一般在起钻前先起出( )柱钻具,然后再下到井底开
• ●    土石坝施工料场规划实际可开采总量与坝体填筑量之比，土料—般为（）。
• ●    某国有事业单位领导马一，在正式帐目外私设内部帐目，并截留事业经费、预算内资金购买高档小汽车，还指示会
• ●    [单选题]党和国家解决民族问题的一项基本国策是____。