选择题:The biggest challenge weall face is to prevent further environmental disasters.

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题目内容:

The biggest challenge weall face is to prevent further environmental disasters. We ________ take action before it is too late.

A.can

B.must

C.may

D.might

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答案解析:

—________ you help me with my spoken English? —No problem.

—________ you help me with my spoken English? —No problem.

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高铁为居民出行提供了便利,从铁路沿线相距360km的甲地到乙地,乘坐高铁列车比乘坐普通列车少用3h.已知高铁列车的平均速度是普通列车平均速度的3倍,设普通列车的

高铁为居民出行提供了便利,从铁路沿线相距360km的甲地到乙地,乘坐高铁列车比乘坐普通列车少用3h.已知高铁列车的平均速度是普通列车平均速度的3倍,设普通列车的平均速度为x km/h,依题意,下面所列

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What a________ boy! Heworked out such a difficult math problem.

What a________ boy! Heworked out such a difficult math problem.

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Now, everybody, pleaseturn to Page ________ and look at the ________picture.

Now, everybody, pleaseturn to Page ________ and look at the ________picture.

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—Which book do you prefer, Harry Potter or Treasure Island?—Harry Potter, of course, ____I ___ my si

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