如果某物品需求变动的百分比恰好等于价格变动的百分比，我们则认为该物品富有需求弹性。()
Although punctual himsef, the professor was quite used____ late for his lecture
A. to have students
B. for students’being
C. for students to be
D. to students’being
“_____Emma’s home？ Isn’t she feeling well？"“She’s still in bed with a fever.”
A. How come
B. What about
C. When
D. Where
下列各式正确的是
A. cos2＜sin1＜tanπ
B. cos2nπ＜cotπ°＜sin1
C. cos1＜cos2＜sin1
D. cos2＜cos1＜cotπ°
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