题目内容
20．When little Jack gets excited，he jumps up and down．分析 当小杰克兴奋时，他跳上跳下．
解答 答案：jumps
根据When little Jack gets excited，可知是当小杰克兴奋时．up and down上上下下，根据生活常识，结合首字母，推断可知：应该是他跳上跳下．跳：jump，主语是he，第三人称单数，故填：jumps．
点评 本题主要考首字母填空，首先要根据所给句子和首字母，推测空白处所缺的单词是什么．单词确定后，再根据人称，时态，短语，句型，语态等，确定单词的适当形式．
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