15．选A　句意：无论何时你有困难，给我说一下，我会尽我所能帮助你摆脱困境。句中I can是定语从句，修饰everything, can后省略了do，故作目的状语的to help you out与can无关。

　　.

　　语篇解读：本文是一篇科普性文章。有些人希望通过饮用苏打水来减肥或防止体重增加。然而新的研究表明，饮用苏打水不但不能减肥反而会增加体重。

　　1．选C　细节理解题。根据文章第一段第三句中的“will help them lose weight”可知，人们饮用苏打水的目的是减肥。故选C。

　　2．选A　细节理解题。根据第一段最后一句“Yet it seems to have exactly the opposite effect, according to a new study.”可知，饮用苏打水不但不能减肥，反而会导致体重增加。故选A。

　　3．选B　细节理解题。根据文章倒数第二段中的“people think they can eat more if they drink diet soda”可知，人们认为饮用苏打水后可以吃得更多。故选B。

　　4．选B　代词指代题。根据文章最后一段所讲述的内容，特别是“the promotion of diet sodas and artificial sweeteners may be risky”可知，They指代的是“diet sodas and artificial sweeteners”。故选B。

　　.参考范文：

　　Helping others is helping yourself

　　As is known to all, no one can avoid difficulties. So everyone needs others' help. However, it is a pity that some people won't offer their help to people in trouble. I have had such experiences. Sometimes when I can't work out a maths problem and turn to my classmates, they often refuse me, which makes me annoyed. In fact, I think they might have problems that I know how to work out.

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