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【单选题】
________ he still paused uncertain, he became aware that the driver was looking closely in from the street at this unusual scene.A.
While
B.
As
C.
Since
D.
Because
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举一反三
【简答题】Explain the two main causes of market failure and give an example of each.
【单选题】The main purpose of the passage is to
A.
explain why it is important to invest in space research
B.
explain how magnetic substorms interfere with satellite communications
C.
define magnetic substorms and identify a recent scientific experiment to study them
D.
compare two alternative approaches to the study of magnetic substorms
E.
demonstrate that unmanned probes are the best way to conduct research in space
【简答题】Which are the two main types of (European) currncy option contract? Please explain in detail.
【简答题】互联网最典型的特征就是 { } 和 { } 。
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