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【单选题】
下列命题正确的是（ ）.A.
函数 是无穷大
B.
当 时，函数 是无穷大
C.
无穷大一定是正数
D.
在自变量同一变化过程中，若 为无穷大，则 为无穷小
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【单选题】“ I was tired out by this long walk . ” ---Which sentence has a different meaning from it?
A.
I was worn out by this long walk.
B.
This long walk tired me out.
C.
I was exhausted by this long walk.
D.
I was bored with this long walk.
【单选题】Which sentence has inverted word order?
A.
At the end of the story is a terrible surprise.
B.
The hinges of the door creaked.
C.
The dog ran after the little girl.
D.
My car died yesterday afternoon.
【单选题】...as the fastest train in the world slipped to a stop in Hiroshima Station. Which sentence has a same explanation and usage to "slip" in the following sentences?
A.
She slipped over on the ice and broke her leg.
B.
She knew that time was slipping away.
C.
They'd slipped some money to the guards.
D.
His popularity has slipped recently.
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