单项选择题

Animals can communicate with each other in a complicated way so they can actually enjoy the same conversation as humans do.  
A、正确
B、错误

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为什么现代大型地面望远镜多采用自适应光学技术?​
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A.为了修正大气扰动对星光的影响
B.为了修正地面振动对望远镜的影响
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D.为了修正重力对主镜形状的影响

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Choose the most appropriate answer by completing the sentences below or answering the questions.
1. Daoxin has got something fun, that is, _______.

A.a robot model
B.a plane model
C.an electric automobile
D.an electric toothbrush