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
考研
The produce departments of the future may look like nothing on earth, and with good reason. Chinese scientists have been growing
The produce departments of the future may look like nothing on earth, and with good reason. Chinese scientists have been growing
admin
2016-12-28
56
问题
The produce departments of the future may look like nothing on earth, and with good reason. Chinese scientists have been growing tomatoes the size of softballs, cucumbers as long as baseball bats and other outsize fruits and vegetables, using seeds that have been shot into space. The seeds are then exposed to seven types of extraterrestrial conditions, from zero gravity and cosmic radiation to subatomic particles.【F1】
As these space veggies grow back on earth, they are selected for desirable traits—bulk, appearance or certain nutrients—then bred through successive generations to ensure that the mutations are consistent.
Chinese scientists don’t understand exactly how a trip into space alters the seeds’DNA and yields such effects, but it’s not just size that changes. 【F2】
Tong Yichao, whose firm, the Beijing Flying Eagle Green Foods Group, has been sending seeds and seedlings aboard Chinese spacecraft since 1999, says it has grown space tomatoes with 27 percent more of the antioxidant beta carotene than ordinary ones, and six-foot-tall cotton plants that produce longer, more flexible threads.
Using conventional methods, "a scientist might create just three new plants in his lifetime," says Tong. "We’ve developed more than 50 since 1999."
【F3】
A dozen or so Chinese firms are paying up to $45,000 a gram to place various flora aboard satellites and manned spacecraft.
The long-term goal; to feed more people and help endangered species escape extinction. To date, nearly 3, 000 botanical species—including garden vegetables, medicinal herbs and flowers—have been sent into orbit and brought back to earth.
【F4】
The commercial promise of China’s space veggies has yet to, er, bear fruit.
It’s legal to sell the cosmic produce, and commercial farms have purchased some space plants. But most are being developed in labs or experimental greenhouses because no one wants to go to market before the safety and quality of the produce have been established. Even so, the idea of space flora is proving irresistible to a novelty-loving Chinese public.【F5】
When Tong displayed a handful of monster space eggplants—the largest of which weighed more than four pounds—at an expo, one disappeared before the show opened.
Hot stuff, for sure.
【F1】
选项
答案
当这些太空蔬菜回到地球上生长时,人们便按照需要的特性——大小、外观或某些营养成分——对它们进行选择,然后再逐代繁殖以确保这些变异得以延续。
解析
本题测试考生以下语言知识点:1.句中的“As these space veggies grow back on earth”是一个状语从句;2.句中的“bulk,appearance or certain nutrients”是一个名词短语充当同位语用来解释说明前面的名词“traits”;3.句中的“to ensure that the mutations are consistent”是一个不定式短语在句中充当目的状语。
转载请注明原文地址:https://kaotiyun.com/show/ItoZ777K
0
考研英语一
相关试题推荐
FormostpeopleBritain’sbouncingeconomy,nowgrowingatitsfastestforthreeyears,iscauseforcheer.Not,【C1】______forth
FormostpeopleBritain’sbouncingeconomy,nowgrowingatitsfastestforthreeyears,iscauseforcheer.Not,【C1】______forth
FormostpeopleBritain’sbouncingeconomy,nowgrowingatitsfastestforthreeyears,iscauseforcheer.Not,【C1】______forth
FormostpeopleBritain’sbouncingeconomy,nowgrowingatitsfastestforthreeyears,iscauseforcheer.Not,【C1】______forth
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
Usingonlyafewcomputers,researchersatthefederalIdahoNationalLaboratorymanagedtolaunchacyberattackthatcrippleda
Today,atthepushofabutton,youcandownloadandprintthewholeofDante’sDivineComedy,usingonlyacomputer,anInterne
随机试题
教育心理学研究认为,焦虑水平与学习效率之间的关系是______。
地面内暗装金属线槽内,电线或电缆不得有接头,接头应在分线盒或线槽出线盒内进行。()
【背景资料】某桥梁工程,承担该工程项目的施工单位项目经理部为达到安全文明施工,预防事故的发生,在施工前制订了施工现场安全生产保证计划。施工单位在施工过程中制订了安全措施:(1)模板安装完毕后,经签认后才可浇筑混凝土;(2)制作支架、木拱架时,主要压力杆的
生产经营单位对从业人员进行安全生产教育和培训的内容包括()。
考虑时间因素的项目财务评价指标称为( )。
卖出套期保值又称()。
下列关于股票回购的说法中,正确的有()。
教育活动中一对最基本、最重要的人际关系是()。
当两柄动物在几百万年前首次出现在地球上时,穿透地球大气层的紫外线辐射量比现在大得多。因此,现在两柄动物数量剧减不会是最近穿透地球大气层的紫外线辐射增加的结果。以上论述基于下列哪项假设?
连年的战争不仅使人们丧失了对生活的热情,还让他们失去了对未来的希望。(deprive)
最新回复
(
0
)