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【简答题】
已知向量 ,函数 (1)求函数 的单调递减区间. (2)将函数 的图象向左平移 个单位,再将所得图象上各点的横坐标缩短为原来的 倍,纵坐标不变,得到函数 的图象.求 在 上的值域.
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【单选题】We came to school very early, but our English teacher, Mr Wang, came to school _____. [ ]
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B.
much early
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earlier
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since; before
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A.
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B.
we; her
C.
our; her
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