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【单选题】
已知a=1.6×10 9 ，b=4×10 3 ，则a 2 ÷2b=（ ）A.
2×10 7
B.
4×10 14
C.
3.2×10 5
D.
3.2×10 14
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反馈参考答案：
举一反三
【单选题】According to the passage, what is the meaning of the phrase 'ups and downs' in the fifth sentence of paragraph two?
A.
Good and bad experiences.
B.
The movement of going up and down.
C.
Conflicts.
D.
Happiness.
【单选题】The writer and teacher Smith ______ through millions of ups and downs since he moved to Sydney. [ ]
A.
have gone
B.
had gone
C.
went
D.
has gone
【简答题】以下关于股票的说法不正确的是（ ）。
【单选题】Everyone will go through life's stages of ups and downs, _____ self-respect plays a key role in the maturity of a person. [ ]
A.
when
B.
which
C.
as
D.
that
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