皮皮学，免费搜题
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【单选题】
若x＞y，则下列式子错误的是 [ ]A.
x-2＞y-2
B.
2-x＞2-y
C.
x+2＞y+1
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【单选题】听力原文：M: How did you like yesterday's astronomy class? W: It was interesting. But the point she was trying to make seemed a little far-fetched. M: Oh, that new theory that ocean water came from comets?...
A.
The effect of the atmosphere on rainfall.
B.
How conditions on Earth support life.
C.
How water originated on Earth.
D.
A new estimate of the age of Earth.
【单选题】听力原文：M: How did you like yesterday's astronomy class? W: It was interesting. But the point she was trying to make seemed a little far-fetched. M: Oh, that new theory that ocean water came from comets?...
A.
The effect of the atmosphere on rainfall.
B.
How conditions on earth support life.
C.
How water originated on earth.
D.
A new estimate of the age of earth.
【简答题】请阐述总需求曲线向右下方倾斜的原因。
【简答题】输入继电器用 字母表示。
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