2016-2017学年高中英语unit4exploringplanetsperiodⅳusinglanguage学业分层测评新人教版选修
6页1、Unit 4 Exploring planets Period Using Language.单词拼写1Why did humans (进化) to walk upright?2I (附加)a copy of 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 (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 (花瓣)9The air was (芬芳的,芳香的)with scents from the sea and the hills.10The meat gives out an unpleasant (气
2、味)【答案】1.evolve2.attach3.typical4.dull5.delicate6.rotted7.beetles8.petals9fragrant10.odour.阅读理解AHave you ever wondered why stems(茎)grow upwards and roots downwards? Why plants always seem to turn towards 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
3、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 the 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 i
4、deal advantage of local and changing conditions.A new means of transport for auxinThe transport of auxin 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 hormone.It is exactly this compartmentalizing (分类) of auxin that seems functionally important for th
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