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
查看答案
The passage supplies information for answering which of the following questions？
A. Where was the mechanism made？
B. What was the primary purpose of the Antikythera mechanism？
C. How did ancient scientists know how to use the Antikythera mechanism？
D. Precisely how many gears did the mechanism have？
E. What is the purpose of computer tomography？
公定利率只对参加该公会或协会的金融机构具有一定的约束作用，因此它对整个市场利率影响不大。()
A. 正确
B. 错误
DENIGRATE:
A. emancipate
B. examine
C. desecrate
D. mollify
E. extol
中国古代的移民主要有两个大的流向：或者由北方草原内迁人中原，或者由中原迁入江南，这两大迁移最主要的影响是()。
A. 促进了社会经济的发展
B. 加剧了民族矛盾
C. 使人口分布趋于平衡
D. 促进了民族融合
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