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2017-2018学年高二英语上学期学业分层测评试题1.doc
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4、f my notes for your information.3Since Im here,Id like to try a_(有代表性的) dish of this country.4The dying fire was throwing out a_(阴暗的) red light.5Dont grasp at the_(脆弱的) branch,or you may break it.6The window frames have _(腐烂)away completely.7There are some _(甲虫)on the plants.8The flower has seven _(
5、花瓣)9The air was _(芬芳的)with scents from the sea and the hills.10The meat gives out an unpleasant _(气味)【答案】1.evolve2.attach3.typical4.dull5.delicate6.rotted7.beetles8.petals 9fragrant10.odour.阅读理解AHave you ever wondered why stems(茎)grow upwards and roots downwards? Why plants always seem to turn towar
6、ds the light and climbing plants run up rather than down? The answer is simple: auxin(生长素),a chemical substance that controls growth in plants.Auxin gives away its secretsAuxin is a plant hormone(激素)Darwin was already interested in it in the 19th century.Only in recent years,however,has the hormone
7、started to give away its secrets,thanks to intensive molecular research.Auxin is produced in the young,growing parts of plants and then transported throughout the plantto a lowlying stem for example.The stem needs to straighten out as soon as possible to be able to absorb the topside,resulting in th
8、e underside growing faster and the stem straightening out.For the same reason,plants in front of windows will always turn to the light.This active regulation of auxin transport allows plants to take ideal advantage of local and changing conditions.A new means of transport for auxinThe transport of a
9、uxin through the plant plays a vital role.And,from all appearances,it is not a simple matter.The researchers identified an important new link and means of transport for auxin: PILS proteins (蛋白质)PILS proteins are vital for auxindependent plant growth and adjust the intracellular(细胞内的)storage of the
10、hormone.It is exactly this compartmentalizing (分类) of auxin that seems functionally important for the various developmental processes.Growing crops more efficiently: the right amount of auxin in the right placeHigher auxin levels at the right moment and in the right place result in better growth and
11、 greater harvest.Better adjustment of auxin levels would make plants grow more efficiently.The researchers hope to contribute to the development of more efficient growing processes by continuing to sort out auxin transport processes.【语篇解读】本文讲述了现代研究条件下对于植物生长素(auxin)的研究成果。1Which of the following is TR
12、UE of auxin according to the text?AIt helps the plant to bend at the right places while growing.BIt prevents the roots of plants from growing faster.CIt is no use when the surroundings have changed.DIt helps the underside of plants grow faster than the topside.【解析】细节理解题。植物生长素的功能在第二段中体现的是resulting in
13、 the underside growing faster,故选D。【答案】D2From Paragraph 3 we know that_Athe researchers are not so sure if the transport for auxin is a new oneBthe levels of auxin remain the same during the growing processes of plantsCPILS proteins delay the growth of plantsDPILS proteins play an important part in t
14、he transport of auxin【解析】细节理解题。由The researchers identified an important new link and means of transport for auxin.可知, PILS proteins在生长素的传播过程中起着至关重要的作用。【答案】D3According to Paragraph 2,the researchers got their results mainly by_Areferring to Darwins theoryBobserving plants straighteningCdoing intensiv
15、e molecular researchDwatching plants in different places【解析】细节理解题。达尔文一开始只是对生长现象感兴趣但并没有得出结论,只有现在的研究者经过了“密集的分子生物学研究”之后才得出结论。【答案】C4Which of the following can be the BEST title for this passage?AWhy Plants Grow towards the Light?BDarwins Dream Has Come TrueCHow Did Scientists Find Out the Secret?DA New
16、Way of the Growing of Plants【解析】主旨大意题。文章一开始就以疑问的方式提出了主题,然后陆续揭示auxin的功能。【答案】ABHumans arent the only ones getting a buzz from coffee. Caffeine can improve memory among honeybees and lead to better pollination(授粉). According to a recent study published in the journal Science.The study was conducted by
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