【名词&注释】
降水量(precipitation)、核苷酸(nucleotide)、韧皮部(phloem)、碱基对(base pair)、初生木质部(primary xylem)
[填空题]对5月份水库出现最低水位的合理解释是
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举一反三：
[单选题]This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense.
A. would
B. should
C. could
D. might
[单选题]What can we infer about primitive birds from the text?
A. They had claws to help them climb.
B. They could fly long distances.
C. They had four wings like hoatzins.
D. They had a head with long feathers on the top.
[单选题]The best title for the text would be___________.
A. The Origin of Olivetti
B. The Success of Olivetti
C. The History of Olivetti
D. The Producich 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
A. 官名
B. 爵位
C. 谥号
D. 行业
[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 （ ）
A. 600个
B. 900个
C. 1200个
D. 1800个
[单选题]What did the scientists do to find out if the e-nose worked?
A. They presented it with all common crops..
B. They fixed 13 sensors inside the device.
C. They collected different damaged leaves.
D. 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。
A. 初生木质部(primary xylem)
B. 初生韧皮部
C. 表皮
D. 皮层
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