单项选择题

If a is increased by 10% and b is decreased by 10%, the resulting numbers will be equal. What is the ratio of a to b（）

A.A
B.B
C.C
D.D
E.E

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单项选择题

For any numbers a, b, and c, For which of the following equations is it true that there is exactly one positive integer that satisfies it’（）

A. none
B. Ⅰ only
C. Ⅲ only
D. Ⅰ and Ⅲ only
E. Ⅰ, Ⅱ, and Ⅲ

单项选择题

Which of the following can be inferred from the passage regarding the Martian atmosphere

A. It has a lower pressure than Earth’s atmosphere.
B. It has a higher surface temperature than Earth.
C. It can most certainly be transformed to be more like Earth’s atmosphere.

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