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【简答题】
人造地球卫星沿椭圆轨道围绕地球运动，在运动过程中，卫星的动量______，卫星对地心的角动量______。(填守恒或不守恒)
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举一反三
【单选题】Thailand is mentioned in the text to______.
A.
reveal the importance of coastal mangrove
B.
serve as an example of the power of nature
C.
show the results of damaging the environment
D.
prove Thailand is not suitable for breeding shrimp
【简答题】The necessary jettisoning of cargo to refloat a stranded vessel may be defined as（ ）．
【单选题】According to the text, the motivation for adopting daylight time______.
A.
was the desire to reduce energy consuming
B.
was much stronger in wartime than in peace
C.
was inseparable from global economic cr
D.
was to slightly cut the impact of oil embargo
【简答题】Which of the following can serve as a title of this text? [A] Hard Time for the Preschoolers [B] Prosperity of Private Schools [C] The Problem for Public Schools [D] Americans 's N0 1 Concern
【简答题】3，7，47，2 207，（ ）。
【单选题】According to the text, all of the following may be the factors in creating anti-slavery sentiment in the British territories except ______.
A.
children's literature
B.
protest by humanitarian groups
C.
the Civil War of 1860
D.
economic changes and the reform. movement
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