首页
登录
职称英语
Trees do more than make life pleasant; they make life【C1】______ . Trees get
Trees do more than make life pleasant; they make life【C1】______ . Trees get
游客
2023-11-12
16
管理
问题
Trees do more than make life pleasant; they make life【C1】______ . Trees get【C2】______ through their roots and, primarily through their leaves, they 【C3】______ carbon dioxide【C4】______ the air. Then, with the action of sunlight on cells 【C5】 chlorophyll and other materials, chemical reactions 【C6】______ , and oxygen is 【C7】______ . Through photosynthesis, an acre of trees produces enough oxygen to sustain three 【C8】______ .
Eating wood might seem odd,【C9】______ many low calorie breads and other baked goods now include powdered cellulose【C10】______ acts as a bulking agent to help hold the foods together.
Trees have always been green machines,【C11】______ substances that humans【C12】______ to use. The ancient Greeks, for example, treated pain【C13】______ a tea made by boiling willow leaves and bark; a tea modern scientists now know contains silicon, a precursor of acetylsalicylic acid aspirin. For centuries, the Chinese have【C14】______ medicines from the ginkgo tree. More recently, researchers isolated and synthesized the chemical ginkgolide from the tree【C15】______ use in treating asthma, toxic shock and other ills.
【C16】______ scientists unlock the secrets of trees, they 【C17】______ surprising facts. In the early 1980s David Rhoades, a chemical【C18】______ at the University of Washington, Seattle, discovered that trees send unseen signals to each other. When willows are attacked by webworms and tent caterpillars, they【C19】______ a chemical that alerts nearby willows. The neighboring trees respond by pumping more tannin into their leaves, making them more【C20】______ for the insects to digest. [br] 【C6】
选项
A、occur
B、occurs
C、occurring
D、occurred
答案
A
解析
考查一般现在时的单复数第三人称形式。
转载请注明原文地址:https://tihaiku.com/zcyy/3180688.html
相关试题推荐
Thebackgardenofourhousecontainsalawn,______verypleasanttositoninsu
Themansittingoppositemesmileddreamily,asif______somethingpleasantin
Thefrontgardenofourhousecontainsalawn,______verypleasanttositonin
Thedetectivewasgreetedwithanunpleasantsmellof______airwhenhestepped
HismannerwassopleasantthatBollafeltat______withhimatonce.A、peaceB、la
To______forhisunpleasantexperienceshedrankalittlemorethanwasgoodfo
Sheisa______girl.A、good-natured,pleasant,well-manneredB、well-mannered,go
Theyhadapleasantchat______acupofcoffee.(1995年考试真题)A、forB、withC、during
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
随机试题
______(尽管人们的兴趣不尽相同),wecanstillmakefriendswiththosewhodonothaveourho
[originaltext]M:Excuseme,isthistheaddepartment?W:Sureis.CanIhelpy
()入选全球系统重要性银行。A.中国银行 B.中国农业银行 C.中
2016年10月8日,甲公司与培训机构签订培训协议,支付1万股公司股份,请培训机
患儿,3岁。出现肛门、会阴部瘙痒,夜间尤甚,睡眠不宁,烦躁不安,或尿频、遗尿,或
根据民事诉讼法律制度的规定,提起民事抗诉的条件有( )。 A.人民法院的判决
A.聚乙二醇4000 B.乳果糖 C.酚酞 D.开塞露 E.硫酸镁为高分
会计电算化简单地说是()在会计工作中的应用。A、会计理论 B、会计准则 C、
在潮湿和易触及带电体场所的照明电源电压最高为()V。A.12 B.24 C.
(2021年第1批真题)关于总时差、自由时差和间隔时间相互关系的说法,正确的是(
最新回复
(
0
)