正确答案:

题目：对5月份水库出现最低水位的合理解释是

解析：D

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举一反三的答案和解析：

[单选题]This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense.

should

[单选题]What can we infer about primitive birds from the text?

They had claws to help them climb.

[单选题]The best title for the text would be___________.

The History of Olivetti

[单选题]古人在分析姓氏起源时说：“氏于国，则齐鲁秦吴……氏于字，则孟孙叔孙；氏于居，则东门北郭。”由此推论，司马、司徒等姓氏应源自

官名

解析：【解析】“司马、司徒”是中国古代较早在中央机构就设有的重要官职，根据材料的推论可知司马、司徒等姓氏应源自官名.

[单选题]已知某DNA分子共含有1000个碱基对，其中一条链上A：G：T：C=1：2：3：4。该DNA分子连续复制2次，共需要鸟嘌呤脱氧核苷酸分子数是 （ ）

1800个

[单选题]What did the scientists do to find out if the e-nose worked?

They made tests on damaged and healthy leaves.

[单选题]植物根和茎中，各种初生组织在次生生长产生的压力之下遭受破坏，但( )例外。

初生木质部