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【判断题】
山楂果酱的生产的主要是氧基果胶作用A.
正确
B.
错误
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举一反三
【简答题】A．Land, oceans and plants can absorb the sun's rays. B．Not all the sun's energy that reaches Earth can stay there. C．It is warmer in outer space than it is on Earth. D．More energy comes in through the...
【简答题】衡量网络性能的主要标准是（）、（）。
【单选题】If the sun’s rays were entirely _______, there would be dramatic changes in the climate on the earth, and the result could be disastrous to the human race. [ ]
A.
covered out
B.
broken out
C.
blocked out
D.
left out
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