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【单选题】
According to the model, what normally signals the disappearance of an El Nino?A.
The arrival in the eastern Pacific of negative sea-level Kelvin waves.
B.
An increase in the speed at which negative Rossby waves cross the Pacific.
C.
A shift in the direction of the winds produced by the start of an anti-El Nino elsewhere in the Pacific.
D.
The reflection of Kelvin waves after they reach the eastern boundary of the Pacific, along Ecuador and Peru.
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【单选题】下列关于无差异曲线的特点描述错误的是______。
A.
无差异曲线的条数是无限的而且密布整个平面
B.
无差异曲线是一簇互不相交的向上倾斜的曲线
C.
无差异曲线的位置越高，它带来的满意程度就越低
D.
落在同一条无差异曲线上的组合有相同的满意程度
【单选题】Welche Lösung enthält die passende Umformung des unterstrichenen Teilsatzes?Aufgabensatz: “Keine Ahnung”, sagt er, indem er Achsel zuckt .
A.
“Keine Ahnung”, sagt er im Zucken seiner Achsel.
B.
“Keine Ahnung”, sagt er durch das Zucken seiner Achsel.
C.
“Keine Ahnung”, sagt er seit dem Zucken seiner Achsel.
D.
“Keine Ahnung”, sagt er vom Zucken seiner Achsel.
【单选题】Even when I'm on holiday I find it hard to completely __________.
A.
switch off
B.
work from home
C.
switch on
D.
on duty
【单选题】---Did you enjoy the party last night? ---Very much. _______ wonderful the party was!
A.
What
B.
How
C.
What a
D.
How a
【单选题】Carey didn't go to the party last night because she ______ the baby for her sister until 9:30.
A.
must have looked after
B.
would have to look after
C.
had to look after
D.
should have looked after
【单选题】听力原文：W: I'm thinking about dropping my swimming class, I'm just not catching on. M: Hold on to it, I did and I learned how to swim eventually. Q: What can be inferred about the man? (16)
A.
He wants to quit the class too.
B.
He knows nothing about swimming.
C.
He made great efforts in learning to swim.
D.
He teaches swimming.
【单选题】下列关于无差异曲线的表述错误的是______。
A.
无差异曲线可以用来描述消费者的偏好
B.
同一条无差异曲线上的任意一点的两种商品的组合带给消费者的满足程度是完全相同的
C.
消费者对不同的无差异曲线上各点的偏好程度是无差异的
D.
无差异曲线是一条能够给消费者带来相同满足程度的两种商品的所有组合的曲线
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