1. Chromosomes are regarded today as the major carriers of genetic material， _________ of DNA and various types of protein.

　　A. consisting

　　B. as to consist

　　C. consist

　　D. which consisting

　　答案：A

　　分析：分词作状语。如果用consist的话，应该用个conj.后面加个完整的句子。

　　参考译文：染色体现今被认为是主要的遗传物质携带者，这些遗传物质由DNA和各种各样的蛋白质组成。

　　2. The leopard seal is the only pinniped _________ preys on penguins and other seals.

　　A. that normally

　　B. of which it normally

　　C. normally

　　D. that it normally

　　答案：A

　　分析：句中出现is和preys两个谓语动词，一定是个复合句;用that引导定语从句，pinniped为先行词，that后为不完整句。

　　参考译文：美洲虎海豹是仅有的捕食企鹅和其他海豹的鳍足类动物。

　　3 _________ “nova” means new， novas are actually stars that have existed for a long time and suddenly flare into brilliance.

　　A. That

　　B. Why

　　C. Although

　　D. It is

　　答案：C

　　分析：空格后有2个完整句，空格处需要一个conj.

　　参考译文：尽管nova意味着新的，但其实新星们是存在了很久而突然闪耀出光辉的恒星。

　　4. Because Mars is farther from the Sun than _________， Mars takes longer to complete a revolution.

　　A. Earth is

　　B. is from Earth

　　C. what is Earth

　　D. is it Earth

　　答案：A

　　分析：比较结构的对称性：Mars is farther …… than Earth is，is后省略了from the Sun

　　参考译文：因为火星比地球离太阳要远，火星绕太阳转一圈的时间要比地球长。

　　5. A social system is _________ of social relations that draws the behavior of its members toward the core values of the group.

　　A. a complex network

　　B. how a complex network

　　C. a complex network and

　　D. a network that is complex

　　答案：A

　　分析：缺宾语。B中的从句只有主语，句子不完整，错;C中and作为连词，后面缺谓语，错;D错，因为of前应该为名词。

　　参考译文：社会系统就是一个社会关系的复杂网络，这个网络里把成员的行为方式向核心价值观靠拢。