问题 单项选择题

某地开展某疫苗预防接种,本地7000居民中2000人接种,累计接种后两年的发病资料,7000居民中共发生该病220人,其中200名发生在未接种者中,20例发生在接种者中,发病率分别为4%和1%,两组某病发率明显差别,疫苗效果明显。你认为此结论

A.正确

B.不正确,未进行显著性检验

C.不正确,接种组和未接种组不是随机抽样的样本

D.不正确,疫苗没有产生较高的免疫效价

E.不正确,两组人数不等

答案

参考答案:C

阅读理解

Green is an important color in nature. It is the color of grass and the leaves on trees. It is also the color of most growing plants.

Sometimes, the word green means young, fresh and growing. Sometimes, it describes something that is not yet ripe(成熟) or finished. For example, a greenhorn is someone who has no experience, who is new to a situation. In the fifteenth century, a greenhorn was a young cow or ox whose horns(角) had not yet developed. A century or so later, a greenhorn was a soldier who had not yet had any experience in battle. By the eighteenth century, a greenhorn had the meaning it has today—a person who is new in a job.

Someone who has the ability to grow plants well is said to have a green thumb. The expression comes from the early nineteen hundreds. A person with a green thumb seems to have a magic touch that makes plants grow quickly and well. You might say that the woman next door has a green thumb if her garden continues to grow long after your plants have died.

The Green Revolution is the name given some years ago to the development of new kinds of rice and other grains. The new plants produced much larger crops. The Green Revolution was the result of hard work by agricultural scientists who had green thumbs.

Green is also the color used to describe the powerful feeling, jealousy(嫉妒). The green-eyed monster is not a frightening creature from outer space. It is an expression used about four hundred years ago by British writer William Shakespeare in his play “Othello”. It describes the unpleasant feeling a person has when someone has something he wants. A young man may suffer from the green-eyed monster if his girlfriend begins going out with someone else. Or, that green-eyed monster may affect your friend if you get a pay rise and she does not.

小题1:Greenhorn now refers to ____.

A.a person who is new in a job

B.a new solider

C.a young horse

D.a thumb小题2:A person who has a green thumb is a person ____.

A.whose garden is greener than others’

B.whose thumbs are in green color

C.who is good at growing plants

D.who is younger than his neighbors小题3:The author is actually talking about ____.

A.colors

B.language

C.politics

D.agriculture小题4: Which of the following statements is NOT true according to the passage?

A.In about the 16th century, a greenhorn meant an experienced soldier

B.The Green Revolution may have some connection with green thumbs

C.The green-eyed monster was probably created by William Shakespeare

D.The green-eyed monster can be used to describe a person who is jealous

单项选择题