试题与答案

被子植物胚珠的主要结构是( ) A.珠被、珠孔、子房壁 B.珠被、极核、卵细胞

题型:选择题

题目:

被子植物胚珠的主要结构是(  )

A.珠被、珠孔、子房壁

B.珠被、极核、卵细胞

C.珠被、受精极核、卵细胞

D.花柱、珠被、珠孔

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0601/b0392aeed4aa32aed8fa71b608a989d6.html

下面是错误答案,用来干扰机器的。

豌豆有高茎和矮茎之分,如果高茎是显性,其基因用A表示;矮茎是隐性,其基因用a表示.当控制豌豆茎的基因组成是AA时,茎的性状是高茎;当控制豌豆茎的基因组成是Aa时,由于隐性基因a控制的矮茎性状在显性基因A的...

试题推荐
题型:阅读理解

D

Americans are pound of their variety- and individuality(多样性与个性), yet they love and respect few things more than a uniform(制服), whether it is the uniform of an elevator operator or the uniform of a five-star general. Why are uniforms so popular in the United States?

Among the arguments for uniforms, one of the first is that in the eyes of most people they look more professional than civilian (百姓的) clothes. People have become conditioned to expect superior quality from a man who wears a uniform. The television repairman who wears uniform tends to inspire more trust than one who appears in civilian clothes. Faith in the skill of a garage mechanic is increased by a uniform. What easier way is there for a nurse, a policeman, a barber, or a waiter to lose professional identity (身份) than to step out of uniform ?

Uniforms also have many practical benefits. They save on other clothes. They save on laundry bills. They are tax-deductible (可减税的). They are often more comfortable and more durable than civilian clothes.

Primary among the arguments against uniforms is their lack of variety and the consequent loss of individuality experienced by people who must wear them. Though there are many types of uniforms, the wearer of any particular type is generally stuck with it, without change, until retirement. When people look alike, they tend to think, speak, and act similarly, on the job at least.

Uniforms also give rise to some practical problems. Though they are long-lasting, often their initial expense is greater than the cost of civilian clothes. Some uniforms are also dear to maintain, requiring professional dry cleaning rather than the home laundering possible with many types of civilian clothes.

小题1:It is surprising that Americans who worship variety and individuality________.

A.still judge a man by his clothes

B.hold the uniform in such high regard

C.enjoy having a professional identity

D.will respect an elevator operator as much as a general in uniform小题2: People are used to thinking that a man in uniform________.

A.suggests quality work

B.discards his social identity

C.appears to be more practical

D.looks superior to a person in civilian clothes小题3:The chief function of a uniform is to________.

A.provide practical benefits to the wearer

B.make the wearer catch the public eye

C.inspire the wearer’s confidence in himself

D.provide the wearer with a professional identity小题4:According to the passage, people wearing uniforms________.

A.are usually helpful

B.have little or no individual freedom

C.tend to lose their individuality

D.enjoy greater popularity

查看答案
微信公众账号搜索答案