2019年mpacc考试英语真题——介词和介词短语19

{01}Sugar is not an important element in bread, but flour is ________．
A.unique
B.essential
C.natural
D.adequate
解析：本题考查四个形容词的区别。A表示“唯一的”；B表示“必不可少的，基本的”；C表示“自然的”；D表示“合适的”。
本题选B。
{02}The book is mainly ________ with Soviet-American relations during the Cold War．
A.recognized
B.talked
C.returned
D.concerned
解析：
本题选D。
{03}We can get there on time ________ the car doesn’t break down．
A.while
B.as long as
C.so that
D.even if
解析：
本题选B。