[单项选择]Animals that could not ______ themselves to the changed environment perished and those that could survived.


A. change
B. adapt
C. modify
D. conform

[单选题] To help animals is （）_humans themselves.
A. help
B. helping
C. helpful
D. to helping

[单选题] It is said that land animals （） from sea animals.
A. were developed
B. developed
C. are developing
D. develops

[单项选择]对于char ch1[20],ch2[20];strcmp(ch1,ch2);,说法正确的是( )。
A. 若ch1==ch2,则 strcmp(ch1,ch2)返回1
B. 若ch1==ch2,则 strcmp(ch1,ch2)返回0
C. 若ch1＞ch2,则 strcmp(ch1,ch2)返回1
D. 若chi＜ch2,则 strcmp(ch1,ch2)返回1

[填空题]

异戊二烯是重要的有机化工原料，其结构简式为CH₂=C（CH₃）CH=CH₂。
完成下列填空：

化合物X与异戊二烯具有相同的分子式，与Br/CCl₄反应后得到3-甲基-1，1，2，2-四溴丁烷。X的结构简式为（）。

[单项选择]Practically all species of animals communicate either through sounds or through a large repertory of soundless codes.
A. Simultaneously
B. Almost
C. Absolutely
D. Basically

[单项选择]A deadly disease has affected these animals.
A. contagious
B. serious
C. fatal
D. worrying

[单项选择]

The relationship between man and animals is close but unequal. Although (61) is true that there are a large (62) of cases of men being the victims of animals(of a man eating tiger, for example), (63) man is the master. (64) the beginning of the human race, animals have been hunted for food. (65) the increasing number of vegetarians in the world, (66) of beef, lamb and pork is (67) consumed(耗费) every day. At work and at play we (68) on animals. Motor transport may have (69) the place of the beast of burden (70) the developed world, but in India life for the farmer would be (71) without the (72) of the cow, and (73) a few third world countries depend on the don-key for transport. We (74) pets at home, and we (75) seeing the elephants play football (76) a monkey play the violin at the circus. The blind have guide dogs, the rich have guard (77) , and (78) the
A. depend
B. take
C. call
D. hold