正确答案: B

这篇文章援用了一些实验事例，虽增强了可信度，但例子过多，如③④⑤段中都用有关老鼠作实验的例子，重复赘余，使文章不够简洁。

题目：下列对文章分析表述错误的一项是（ ）（3分）

解析：B

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学习资料的答案和解析：

[单选题]Now the air in our city is _______ than it used to be. Something must be done to stop it.

even worse

[单选题]III读理解． (20分)A

John and his sister

解析：Ⅲ．21.C 【解析】从“we enjoyed having you and your sister here”可知。

[单选题]4．— Did you have anyone ______the trees?—Yes，l had the trees ______．

water; watered

解析：4.D【解析】此题考查have的用法．have sb. do意为“让某人做……”；have sth. done意为“让某事被做”。故答案为D。