首页
登录
职称英语
Many people dream of having a smarter brain. Princeton neurobiologist Josep
Many people dream of having a smarter brain. Princeton neurobiologist Josep
游客
2023-12-07
76
管理
问题
Many people dream of having a smarter brain. Princeton
neurobiologist Joseph Z. Tsien found the key. In September he
announced that he built a better mouse by altering a gene that 【M1】______
affects learning and memory. A similar process of gene
manipulation might conceivably be used one day to boost up 【M2】______
intelligence in humans.
The secret lies in a feature of brain cells which called the 【M3】______
nomda receptor, which Tsien likes to a cylindrical tube or window 【M4】______
that mediates the flow of information. When the window is open,
chemicals called neurotransmitters flow through easily and
memory is registered or stored. Tsien noticed that the receptor 【M5】______
worked more efficiently when teamed with the gene NR2B, so he
introduced extra NR2B genes into a batch of fertilized mouse eggs.
In a normal mouse, the memory window is open in just 【M6】______
150-thousandths of a second. In Tsien’s specifically engineered 【M7】______
mice, the window opens for 250-thousandths of a second, long
enough to make a remarkable impression in memory retention. 【M8】______
When he pitted his mice with common mice, they won paws down. 【M9】______
Ordinary mice could recognize a Lego block for 12 hours, but
smart mice could remember the block for up to three days. "That’s
a profound enhancement," Tsien says.
Can it be done with humans? Maybe, so genetic engineering 【M10】______
will have to make some extraordinary advances first. And some
thorny ethical issues will have to be resolved. Meanwhile, Tsien
promises to keep his furry little geniuses locked up in a lab, far
from your larder. "Otherwise," he says, "you might need a smart cat
or a smart mousetrap to catch them." [br] 【M1】
选项
答案
∧built—had
解析
时态错误。当主句的动词为announce宣布后跟从句时,一般都是宣布正在进行某事或已经完成某事。因为给定短篇中从句动词是以built即过去时出现的,因此应该改成过去完成时而不是过去进行时。此外,从下文对试验结果的分析也可以看出,这个试验已经完成。
转载请注明原文地址:http://tihaiku.com/zcyy/3251125.html
相关试题推荐
WhyWeDon’tLikeEnglishClassesI.People’smisunderstandi
WhyWeDon’tLikeEnglishClassesI.People’smisunderstandi
WhyWeDon’tLikeEnglishClassesI.People’smisunderstandi
WhyWeDon’tLikeEnglishClassesI.People’smisunderstandi
WhyWeDon’tLikeEnglishClassesI.People’smisunderstandi
WhyWeDon’tLikeEnglishClassesI.People’smisunderstandi
WhyWeDon’tLikeEnglishClassesI.People’smisunderstandi
[originaltext]Woman:Itwouldbedifficultformanypeopletodofileamountof
Whatimpactcanmobilephoneshaveontheirusers’health?Manypeopleworry
Whatimpactcanmobilephoneshaveontheirusers’health?Manypeopleworry
随机试题
Hewasactually______fortheaccident,thoughithadnotinfactbeenhisfaul
BoththeSenateandHousehealthcarebillsproposeincentivestoboostcorp
Americanshavelonger,butnotnecessarilyhealthierlivesduetohighrates
预作用报警阀组的试水阀放水及其启动性能测试至少()进行一次检查与维护。A.每月
关于气体灭火系统维护管理周期检查项目的说法,错误的有()。A.每日应检查低
生物活性最强的雌激素是A.E3B.E2C.卵泡刺激素D.雌酮E.孕酮
应用糖皮质激素时,根据激素昼夜分泌节律采用隔日疗法的目的是A.防止发生类肾上腺皮
商用房贷款利率不得低于中国人民银行规定的同期同档次的1倍。()
在实际工作中,财政管理体制一般指的是()管理体制。A.预算 B.税收 C.
工程项目投资控制的纠偏工作可采取()措施。A.经济 B.行政 C.技术
最新回复
(
0
)