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
24
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] 【C20】
选项
A、easy
B、easier
C、difficult
D、difficulty
答案
C
解析
根据题意应该为“很难消化”,用比较级,正确形式为more difficult,选择C。
转载请注明原文地址:https://tihaiku.com/zcyy/3180702.html
相关试题推荐
To______forhisunpleasantexperienceshedrankalittlemorethanwasgoodfo
Sheisa______girl.A、good-natured,pleasant,well-manneredB、well-mannered,go
Whatapleasantday,______?A、isitB、shan’titC、isn’titD、won’titC反意疑问句。此句的陈
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
Treesdomorethanmakelifepleasant;theymakelife【C1】______.Treesget
随机试题
[originaltext]Therearemanylegalrightstomakesurethatpeoplewillbet
【B1】[br]【B2】[audioFiles]audio_eufm_j01_007(20082)[/audioFiles]miserable
TodaythewriterHansChristianAndersenisknownasawriterofstoriesfor
根据《印刷业管理条例》,出版单位委托印刷书刊,必须( )等。A.出示印刷物资供
男性,42岁,半个月前咽痛、咳嗽,1周来水肿、尿少、乏力。化验结果:Hb95g
A.四日极量 B.七日常用量 C.二日极量 D.三日常用量 E.一次常用
按照《普通高中美术课程标准(实验)》,美术教科书设计和编写的依据是()。A.
(2018年真题)期货业协会的业务活动应当接受期货交易所的指导和监督。()
凡是当期已经实现的收入和已经发生或应当负担的费用,不论款项是否收付,都应当作为当
下列关于水泥混凝土路面纵缝设置与施工,说法错误的是( )。A.当一次铺筑宽度小
最新回复
(
0
)