According to the passage, many mammals developed___．

A．from a special kind of dinosaurs

B．from peculiar mammals

C．after the extinction of dinosaurs and other reptiles

D．after the extinction of all small mammals

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答案解析

C。本题考查文章的重要细节。根据题干信息词many mammals,将答案锁定在文章第三段第二句。第三段第二句指出，有许多哺乳动物，其中大部分是在六干五百万年前恐龙和其他爬行动物灭绝之后进化而来的，那次灭绝为已经存在的少量小型哺乳动物提供了机会，由此可知，现有的许多哺乳动物都是在恐龙和其他爬行动物大规模灭绝之后由小型哺乳动物进化而来的，故选C。

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1 Primates are social animals because

A．they are hand-feeders

B．of their anatomical features

C．they are arboreal

D．they depend on each other

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2 根据以下资料，回答题：
        While Mother was in New Orleans, I was in the care of my grandparents．They were incredibly conscientiousabout me．They loved me very much; sadly, much better than they were able to love each other or, in mygrandmother's case, to love my mother．Of course, I was blissfully unaware of all this at the time．I just knew that Iwas loved: Later, when I became interested in children growing up in hard circumstances and learned something ofchild development from Hillary's work at the Yale Child Study Center, I came to realize how fortunate I had been．For all their own demons, my grandparents and my mother always made me feel I was the most important person inthe world to them．Most children will make it if they have just one person who makes them feel that way．I hadthree．
        My grandmother, Edith Grisham Cassidy, stood just over five feet tall and weighed about 180 pounds．Mammaw was bright, intense, and aggressive, and had obviously been pretty once．She had a great laugh, but shealso was full if anger and disappointment and obsessions she only dimly understood．She took it all out in ragingtirades against my grandfather and my mother, both before and after I was born, though I was shielded from mostof them．She had been a good student and ambitious, so after high school she took a correspondence course innursing from the Chicago Sebool of Nursing．By the time I was a toddler she was a private-duty nurse for a man notfar from our house on．Hervey Street．I can still remember running down the sidewalk to meet her when she camehome from work．
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The author came to know that he was most fortunate because

A．his grandparents loved him more than his mother did

B．his grandmother loved her grandson more than she did her daughter

C．his grandparents and his mother made him the most important person in the world

D．his grandparents and his mother take him as the apple of their eye

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3 Which of the following description about the author's grandmother is NOT true?

A．She was intelligent, ambitious, but very bad-tempered．

B．She became quite mild and polite after the birth of her grandson．

C．She always tried to conceal her aggressiveness from her grandson．

D．She used to study the course in nursing and practiced the profession afterwards．

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