托福考试语法题笔记1（二）
18. _________ “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。
19. 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。
20. 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。