It is believed that human activities accountfor the global warming．题目和参考答案——青夏教育精英家教网—

4．It is believed that human activities accountfor the global warming．

分析人们相信人类活动造成了全球变暖．

解答答案：account
解析：根据前面的"人类活动"、后面的"全球变暖"及横线处所给提示可知本题考查account for"解释；说明；造成；对…负责"这一固定短语，又句子的主语activities为复数形式、时态为一般现在时，故谓语动词使用原形即可．综上，本题答案为：account．

点评本题考查单词填空，做此类题目时一定要从结构、句意及其它各方面仔细分析句子，判断句子所缺成分；再结合所给提示确定最终答案．

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