转导是以噬菌体为媒介,将细菌的小片断染色体或基因从一个细菌转移到另一细菌的过程。转导

题型:填空题

问题:

转导是以噬菌体为媒介,将细菌的小片断染色体或基因从一个细菌转移到另一细菌的过程。转导分为普遍性转导和()转导。

考点:生物学动物遗传学动物遗传学题库
题型:填空题

约40%的糖尿病患儿第一次就诊时表现为()。

A.多尿

B.烦渴

C.消瘦

D.精神呆滞

E.酮症酸中毒昏迷

题型:填空题

Whenever we are in _____ trouble, we should never lose _____ heart. [ ]

A. a; the

B. a; a

C. /; /

D. /; the

题型:填空题

毛发的生长受人体健康影响而有快有慢,平均每日大约生长()mm

A.0.25到0.26

B.0.28到0.30

C.0.20到0.22

D.0.27到0.4

题型:填空题

阅读理解。

     What can help you make a fortune in the future? Graduating from a top university might not be

enough. A new study from the University of Essex in Britain has shown that the more friends you

have in school, the more money you'll earn later.

     The idea that popularity could have a serious impact on one's earning potential shouldn't come

as too much of a surprise. The researchers noted that if you want to get ahead in life, social skills

and networking are easily as powerful as talent and hard work.

     "If a person has lots of friends, it means that he or she has the ability to get along with others in

all kinds of different situations," said Xu Yanchun, 17, from Nantou High School in Shenzhen, who

totally agreed with the recent finding. "Also, friends always help each other. They not only create

wider social circles for you but lift your mood when you occasionally feel depressed," said Xu.

She believed that all this helps you "earn a higher salary".

     Maybe that's why some people think the younger generations are in the age of friendaholism

(交友狂症). A woman even complained that the networking website Facebook's 5,000friend

limit was too low for her large reserve of social contacts.

     But what does a friend mean? Should friends be regarded as a form of currency?

     "Call me uncool, but I think of a friend as an actual person with whom I have an actual history

and whom I enjoy actually seeing. It seems, however, that this is no longer the definition(定义)of

'friend'," said Meghan Daum, who works with The Los Angeles Times in the US.

     Daum despised(鄙视)the idea that quantity trumps(胜过)quality in the age of friendaholism. She

thought the idea of friendship, at least among the growing population of Internet social networkers,

was to get as many of notreallyfriends as possible. For example, a friend might be someone you

might know personally but who could just as easily be the friend of a friend of some other Facebook

friends you don't actually know.

1.What's the main idea of the passage?

A.Making friends is important.

B.Making friends makes you earn more money.

C.Friends give you success.

D.Social skills are important.

2.Which of the following sentences is TRUE?

A.It is surprising that making more money is popular with people.

B.If you want to win in life, social skills are as important as talent and hard work.

C.The young now have friendaholism.

D.Friends do not create your wider social circles but lift your mood when you occasionally feel

depressed.

3.What's the opinion of Xu Yanchun about making friends?

A.Making friends may help you a lot in your life.

B.Making friends can get a lot of money.

C.Making friends can make you work hard.

D.Making friends can improve your ability to work.

4.What's the author's attitude?

A.Objective.  

B.Subjective.

C.Neutral.  

D.Optimistic.

题型:填空题

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