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【单选题】
化石燃料使用最多的年代是A.
1840-1900
B.
1920-1940
C.
1940-1980
D.
1990-2010
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】It is because English is useful ___.
A.
why we study it hard
B.
what we study hard
C.
that we study it hard
D.
which we study hard
【单选题】There is a big cake. _____ share it. [ ]
A.
May be we can
B.
We may be
C.
Maybe we can
D.
Maybe can we
【单选题】We didn't know _____, so we gave it to the police. [ ]
A.
whose wallet it is
B.
whose wallet was it
C.
whose wallet is it
D.
whose wallet it was
【单选题】What did we usually do concerning depression?
A.
We didn't pay much attention to it.
B.
We paid too much attention to it.
C.
We tried to avoid it.
D.
We simply ignored it.
【单选题】We don't need air conditioning, ________.
A.
nor can we afford it
B.
neither can afford it
C.
nor we can afford it
D.
neither we can afford it
【简答题】数组是一系列相关数据的集合,数组中的每一个数据称为一个元素,每个元素包括下标和值两部分。根据下标的类型不同,数组可以分为_________数组和_________数组。其中前者的下标是从0开始的数字,后者的下标可以是数字也可以是字符串。
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