首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Trees do more than make life pleasant; they make life【C1】______ . Trees get【C2】______ through their roots and, primarily through
Trees do more than make life pleasant; they make life【C1】______ . Trees get【C2】______ through their roots and, primarily through
admin
2013-08-03
49
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.
【C13】
选项
A、by
B、on
C、in
D、with
答案
D
解析
treat sb./sth.with sth.结构。
转载请注明原文地址:https://kaotiyun.com/show/O2LK777K
0
专业英语四级
相关试题推荐
Hemighthavebeenkilled______thetimelyarrivaloftheambulance.
Thebackgardenofourhousecontainsalawn,______verypleasanttositoninsummer.
Accordingthenews,theUNhassetstandardsforKosovoon______.
Accordingthenews,theUNhassetstandardsforKosovoon______.
______peoplewerekilledduringtheaircrash.
Thefrontgardenofourhousecontainsalawn,______verypleasanttositoninsummer.
Oneoftheaimsofteachingscienceis,throughlearning,toenablestudentstodevelopacompletepersonalitybycreativity,ho
随机试题
智力是下列哪种能力的综合?【】
解救中度有机磷酸酯类中毒可用
患者,女,27岁。上前牙咀嚼不适1个月余。口腔检查可见远中邻腭面深龋,穿髓,探诊(-),叩诊(±),牙髓活力电测验(-),牙周检查(-)。X线片示:根尖有边界不清楚的透影区,呈云雾状。该患者最佳治疗措施是
患者,女,68岁,因结肠癌入院,拟行手术治疗。护士执行灌肠时,应为该患者安置的体位是
地籍管理信息系统的信息查询方式主要有()。
企业在规定范围内从银行提取现金,应当写明用途,由()签字盖章,开出现金支票。
中国电影发展了百年之久,能够横行天下的,还是只有武侠片这一个类型。武侠片之所以能够( ),不断求变正是其生命力所在。可以说,武侠电影自诞生时起就一直在变化。通过一次次变化,武侠电影获得了一次次的( )。最恰当的一项是( )。
AboutonemilliontouristsgotoBarcelonaeveryyear,justtovisittheGaudi’sChurch.Thisunusualchurchhasastrangehisto
LowCarbonLifestyle低碳的生活方式Writeanessayof160-200wordsbasedonthedrawing.Inyouressay,youshould1)describethedraw
WhatdoweknowaboutSusan?
最新回复
(
0
)