[单项选择]The most difficult problem we faced with is to reduce China's population to less than 1 billion within 20 years.
A. 现在摆在我们面前最艰巨的问题就是在20年里把中国人口降低到10亿。
B. 我们所面临的最艰难的问题是在20年里使中国的人口减少10亿。
C. 我们所面临的最艰难的问题是在20年里把中国人口降低到10亿以下。
D. 最艰巨的问题摆在我们面前就是在20年里把中国人口减少10亿。

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[单项选择]This difficult problem we face in the project has to be tackled before we can ______ to others.
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[单项选择]First of all, this difficult problem has to be tackled, thus ______ us to proceed to the others.
A. to enable
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[单项选择]To solve such a difficult problem is really ______ my grasp.
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[单项选择]It's really a difficult problem to ______.
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[单项选择]This is so difficult a problem that the scientist is known to ______ on it for about ten years, but hasn't found an answer yet.
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[单项选择]When we talk with a foreign lady, in most cases we should not ask such personal questions as her age.
A. 但我们和一位外国女士谈话时，要防止我们问她个人问题，像年龄。
B. 但我们和一位外国女士谈话时，在很多事件中我们不应该问她如年龄这样的个人问题。
C. 与外国女士交谈时，在多数情况下我们不能把年龄作为个人问题来问。
D. 我们在同外国女士交谈时，多数情况下我们不问及年龄这样的个人隐私问题。

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[单项选择]This mathematic problem was so difficult that no student and no teacher_________ able to solve it.
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