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【判断题】
光在四维时空中是直线运动的,在三维空间看也是直线。()A.
正确
B.
错误
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举一反三
【单选题】Countries are major participants in international trade. There are about ______ countries in the world now.
A.
100
B.
200
C.
300
D.
400
【简答题】听力填空 There are about 4,400 (1)__________ of animals in China, (2)__________ birds and 2,300 fishes included. (3)__________ one hundred of the (4)__________ enered animals live in China. The (5)___...
【简答题】蔬菜作物为什么要进行嫁接换根？
【简答题】There are about 400 million Chinese people learning English, which makes up ________ of the whole population in China .
【单选题】We said to them:"Don't make any noise, please." We ______ them ________ make any noise.
A.
said to, not to
B.
asked, don't
C.
asked, not to
D.
said to, don't
【简答题】There are nearly 400 different types of sharks, but only about 30 types have even been reported as attacking human beings. The chances of being attacked by a shark are very small compared to other dan...
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