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【单选题】
等产量线上某一点的切线的斜率等于( )。A.
预算线的斜率
B.
等成本线的斜率
C.
边际技术替代率
D.
边际报酬
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【单选题】Most athletes have reached their peak by the time they are 20.
A.
Pitch
B.
top
C.
Point
D.
Tip
【单选题】Tony will return the book to you ______ he finishes reading it.
A.
until
B.
while
C.
when
【简答题】我们可以通过判断主机面板上的________来判断硬盘是否在工作。
【单选题】He will spend six hours at his desk _______ he finishes his composition.
A.
before
B.
until
C.
after
D.
when
【单选题】She is going for vacation when she finishes ____________ her new book.
A.
to write
B.
writes
C.
writing
D.
write
【单选题】She’s______ to be a teacher when she______ her studies. [ ]
A.
goes, finishes
B.
going, finishes
C.
go, finish
D.
going, will finish
【单选题】When Dan finishes his trainning, he wants to work in a ____.
A.
hospital
B.
laboratory
【单选题】听力原文：W: Hi, Dan, would you please check my car? It consumes more gas than usual these days. Besides, the engine makes a bigger noise. M: No problem, Mrs. White. Everything will be ok when you come to ...
A.
At the woman's home.
B.
At a gas station.
C.
At a bus station.
D.
At a garage.
【简答题】我们可以通过主机面板上的________判断来判断主机电源是否接通。
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