施行人工降雨时，是飞机在云层里撒干冰，干冰迅速____而吸热，使云层中水蒸气急剧遇冷而____成小冰晶，小冰晶逐渐变大，在下落过程中又____成小水滴落下来．（填物态变化名称）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。
 Hi Chris

    I think going to a gym is a good way to keep health and strong. If your friend wants to be stronger, and he should try to go there more often.

    Yes, there have some pills to make you look strong. Therefore, they have side effects, that will damage your health. After your friend taking this kind of pill for some time, his hair might fell out or he might have health problems, some of which may even affect her liver or heart. Some athlete, whose achievements were great, died very young because they take this kind of pill. I don't think your friend should take the risk .

    Tell your friend not take the pills because he may have health problems in the future, when it is too late.

                                                                                                                                                                                                      Jeff

下列句中加线的词语使用有误的一项是(    )