正确答案:

题目：地球上可利用的淡水资源占地球总水量的比例约为20%。（ ）

解析：√

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举一反三的答案和解析：

[单选题]个人的社会价值的大小主要取决于

个人对社会所作贡献的大小

[单选题]Janet: It is the kind of day when you want to go outside.Bob： Janet,__________ Do you want the afternoon off?.

let's get to the point.

解析：Janet首先说天气好，适合出去，而Bob却把话题转向今天下午是否休息的事，由此可见选项A(让我们谈点正事)符合题意，Let’s get to the point表示两人谈话时突然要谈要点。

[单选题]Passage OneAnimals have different ways of protecting themselves against wintertime weather. Some animals grow heavy coats of fur or feathers, while others dig into the ground to find a warm wintertime home.

takes place only during a particular season