16.Some
of the simplest questions about earthquakes remains hard_____.
A.to be answered. ? B.to answer
A,b
17.In a place like this old palace people tend to think___thousands of years.
A.in terms of. ? ? ? B.by means of. ? C.in the form of. ? ?D.for the sake of
A,啥意思，c?
18.As a matter of fact,Saudi Arabia's oil reserves______those of Kuwait.
A.are the second of. ? ?B.are second to only. ? ?C.are second only to. ?D.are
the second only to. ?
C,啥结构？
19.The air in the city is usually dirtier than____in the country.
A.the one. B.that. ? C.those. ?D.one?
B,a？
20.Hearing Mummy at the door,_____.
A.off the little girl jumped from the bed
B.?off jumped ?the little girl ?from the bed
C.off ?from the bed jumped the little girl
D.off jumped from the bed the little girl
B
问号忽略~~~求解释谢谢