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【简答题】
按传感器的能源分类,传感器可分为 和 两类。
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举一反三
【简答题】阅读理解。 Dreams may be more important than sleep. Some people don't need much sleep. But we all need to dream, scientists say. Dreams take up about one quarter of our sleeping time. People have several d...
【单选题】We ________ have bought so much food now that Suzie won't be with us for dinner. [ ]
A.
may not
B.
needn't
C.
can't
D.
mustn't
【单选题】— Listen! Is Tom singing in the classroom? — No. It be Tom. He has gone to Paris. [ ]
A.
may not
B.
needn't
C.
can't
【简答题】阅读表达。 Dreams may be more important than sleep. Some people don't need much sleep. But we all need to dream, scientists say. (3) Dreams take up about one quarter of our sleeping time. People have sever...
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