题目内容
7．Gravity is a force that stops us fromfloating （floa） in the air．分析 重力是一种阻止我们漂浮在空中的力量．
解答 答案：floating 考查单词填空．根据题干：考查固定短语：stop sb from doing sth阻止某人做某事 from是介词，后面要加名词或动名词，float是动词，动名词是 floating
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
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