. Measles a kind of infectious illness. A．is B．are C．were D．have been 题目和参考答案——青夏教育精英家教网—

题目内容

. Measles ______ a kind of infectious illness.

A．is

B．are

C．were

D．have been

【答案】

【解析】略

练习册系列答案

课课练与单元测试系列答案

世纪金榜小博士单元期末一卷通系列答案

单元测试AB卷台海出版社系列答案

黄冈新思维培优考王单元加期末卷系列答案

相关题目

Everywhere man is altering the balance of nature．He is facilitating the spread of plants and animals into new regions, sometimes deliberately, sometimes unconsciously．He is covering huge areas with new kinds of plants, or with houses, factories, slag-heaps and other products of his civilization．He exterminates some species on a large scale, but favours the multiplication of others．In brief, he has done more in five thousand years to alter the biological aspect of the planet than has nature in five million．

Many of these changes which he has brought about have had unforeseen consequences．Who would have thought that the throwing away of a piece of Canadian waterweed would have caused half the waterways of Britain to be blocked for a decade, or that the provision of pot cacti for lonely settlers’ wives would have led to Eastern Australian being overrun with forests of Prickly Pear? Who would have prophesied that the cutting down of forests on the Adriatic coasts, or in parts of Central Africa, could have reduced the land to a semidesert, with the very soil washed away from the bare rock? Who would have thought that improved communications would have changed history by the spreading of disease-sleeping sickness into East Africa, measles into Oceania, very possibly malaria into ancient Greece?

These are spectacular examples; but examples on a smaller scale are everywhere to be found．We make a nature sanctuary for rare birds, prescribing absolute security for all species; and we may find that some common and hardy kind of bird multiplies beyond measure and ousts the rare kinds in which we were particularly interested．We see, owing to some little change brought about by civilization, the starling spread over the English country-side in hordes．We improve the yielding capacities of our cattle; and find that now they exhaust the pastures which sufficed for less exigent stock．

The following examples except ________ reflect man altering the balance of nature．

A．man is covering huge areas with new kinds of plants

B．man is facilitating the spread of animals into new regions．

C．man is killing some species on a large scale

D．man is getting to know the importance of keeping the balance of nature．

What had a piece of Canadian waterweed cause?

A．Eastern Australian was overrun with forests．

B．Half the waterways of Britain blocked for a decade．

C．In parts of central Africa, the land reduced to a semidesert．

D．Disease-sleeping has been caused．

What have spread diseases?

A．Disease-sleeping sickness． B．Measles．

C．Improved communications． D．Malaria．

We make a nature sanctuary for rare birds but __________

A．some common and hardy kind of bird multiplies

B．rare kinds multiply

C．all bird multiply

D．no bird multiply

The main idea of the passage is _________．

A．that man is deliberately destroying the balance of nature

B．that man has foreseen the consequences of altering the balance old nature

C．that improved communications have changed history

D．that man is altering the balance of nature

Recently measles has been among children in the mountain village.

A.about　　　　　　B.around　　　　C.all over　　　D.above

Did you get a flu shot this year? For the first time, the Centers for Disease Control and Prevention in the US is recommending that all children ages 6 months through 18 years receive the flu vaccine.
Vaccines battle diseases caused by bacteria and viruses. A weakened form of the germ is introduced into the body. The body makes special substances called antibodies to fight the germs. If the actual germs were to attack, the antibodies would fight them.
Because there are many kinds of flu viruses, scientists must create a new vaccine formula (配方) each year. Researchers must make a prediction.
“The flu vaccine is not as effective as the polio (小儿麻痹症) vaccine or the measles(麻疹) vaccine,” says Dr. William Schaffner of Vanderbilt University School of Medicine.
“It’s not a great vaccine, but it is quite a good vaccine.”
But a flu vaccine doesn’t work for everyone. There are certain people who should be careful about taking it. Because the vaccine is produced from eggs, those who are allergic (过敏的) to eggs should not take it. If you have a fever, you should wait until you recover.
Some people are afraid that they might get the flu from the flu shot. Scientist say that it is not possible, because the viruses in the flu shot are inactivated (灭活的). But some minor side effects such as low-grade fever and body aches could occur. If they do, they begin soon after the shot and usually last only one to two days.
60. What is an antibody?
A. An antibody is a vaccine formula
B. An antibody is a germ that is introduced into the body
C. An antibody is a vaccine that fights diseases.
D. An antibody is a special substance to fight germs.
61. Which of the following statements is NOT true?
A. Not everyone is suitable for the flu vaccine.
B. The flu vaccine is not so effective as the measles vaccine
C. Flu viruses create new vaccine formulas each year.
D. People can’t take the flu vaccine at anytime.
62. It can be inferred from the text that _____.
A. scientists should change the vaccine formula each year
B. vaccines can battle diseases caused by bacteria and viruses
C. all children ages 6 months through 18 years can receive the flu vaccine
D. scientists are responsible for the side effects of the flu vaccine
63. Which of the following would be the best title for the text?
A. The flu vaccine B. Side effects of the flu vaccine
C. How to prevent the flu D. Not everyone can get the flu shot

Vaccines battle diseases caused by bacteria and viruses. A weakened form of the germ is introduced into the body. The body makes special substances called antibodies to fight the germs. If the actual germs were to attack, the antibodies would fight them.

Because there are many kinds of flu viruses, scientists must create a new vaccine formula (配方) each year. Researchers must make a prediction.

“The flu vaccine is not as effective as the polio (小儿麻痹症) vaccine or the measles(麻疹) vaccine,” says Dr. William Schaffner of Vanderbilt University School of Medicine.

“It’s not a great vaccine, but it is quite a good vaccine.”

But a flu vaccine doesn’t work for everyone. There are certain people who should be careful about taking it. Because the vaccine is produced from eggs, those who are allergic (过敏的) to eggs should not take it. If you have a fever, you should wait until you recover.

Some people are afraid that they might get the flu from the flu shot. Scientist say that it is not possible, because the viruses in the flu shot are inactivated (灭活的). But some minor side effects such as low-grade fever and body aches could occur. If they do, they begin soon after the shot and usually last only one to two days.

60. What is an antibody?

A. An antibody is a vaccine formula

B. An antibody is a germ that is introduced into the body

C. An antibody is a vaccine that fights diseases.

D. An antibody is a special substance to fight germs.

61. Which of the following statements is NOT true?

A. Not everyone is suitable for the flu vaccine.

B. The flu vaccine is not so effective as the measles vaccine

C. Flu viruses create new vaccine formulas each year.

D. People can’t take the flu vaccine at anytime.

62. It can be inferred from the text that _____.

A. scientists should change the vaccine formula each year

B. vaccines can battle diseases caused by bacteria and viruses

C. all children ages 6 months through 18 years can receive the flu vaccine

D. scientists are responsible for the side effects of the flu vaccine

63. Which of the following would be the best title for the text?

A. The flu vaccine B. Side effects of the flu vaccine

C. How to prevent the flu D. Not everyone can get the flu shot

试题分类