题目内容
You’d better plan a(an) ___route when you plan your journey just in case if there is any problem on your original route.A various B alternate C change D shift
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Although our planet as a whole may never ____of water, it is important to remember that clean freshwater is not always available where and when humans need it.A run out B lack C short D inadequate
On every Monday morning, students would have school assembly in the hall and then afterwards they would go back to their ___classes.A respectable B respectful C respective D respected
The memo is to remind you that the meeting you set with Mr. Green has been ___to next Monday.A put away B put off C put down D put up
向量x与向量y的内积是一个实数。（）
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