题目内容

This worm can’t be seen in any place, but ______ the soil is loose.

A. if                  B. whose               C. where                 D. in which

练习册系列答案
相关题目

Whatever our differences as human beings are we all think we’re more like the rest of the animal world than we realize. It is said that we share 40 per cent of our genetic(遗传的)structure with the simple worm.

But that fact has helped Sir John Sulston win the 2002 Nobel Prize for Medicine. Sir John is the founder of the Sanger Institute in Cambridge, which was set up in 1992 to get further understanding of the human genome(染色体组).

To help them do this, they turned to the worm. The nematode(线虫类的)worm is one of the earliest creatures on planet earth. It is less than one millimeter long, completely transparent and spends its entire life digging holes through sand. But it still has lots to say about human life, and what can be done to make it better.

What the worm told Sir John and his colleagues was that each of the cells in the human body is programmed like a computer. They grow, develop and die according to a set of instructions that are coded in our genetic make-up.

Many of the diseases that humans suffer from happen when these instructions go wrong or are not obeyed. When the cell refuses to die but carries on growing instead, this leads to cancer. Heart attacks and diseases like AIDS cause more cell deaths than normal, increasing the damage they do to the body. Sir John was the first scientist to prove the existence of programmed cell death.

Sir John Sulston got a Nobel Prize for Medicine because he has         .

A.found that human beings are similar to the worm

B.got the fact we share 40 per cent of our genetic structure with the simple worm

C.found the computer which controls each of the cells in the human body

D.proved that cell death is programmed

People might be seriously ill if the cells in their body        .

A.grow without being instructed B.die regularly

C.fail to follow people’s instructions  D.develop in the human body

The underlined word“they”(paragraph 5)refers to        .

A.cell deaths       B.diseases    C.instructions      D.cells

What is the subject discussed in the text?

A.The theory of programmed cell deaths.     B.A great scientist—Sir John Sulston.

C.The programmed human life.             D.Dangerous diseases.

Scientists in Canada say big ocean fish have almost disappeared from the world since the start of industrial fishing in the nineteen-fifties. The scientists found that population of large fish like tuna; swordfish and cod have dropped by ninety percent in the past fifty years.
The study took ten years. The researchers gathered records from fishing businesses and governments around the world. The magazine Nature published the findings.
The scientists say the common method called longline fishing is especially damaging to populations of large fish. This method involves many fishing lines connected to one boat. These wires can be close to one-hundred kilometers long. They hold thousands of sharp metal hooks to catch fish.
Longline fishing is especially common in the Japanese fishing industry. Records showed that Japanese boats used to catch about ten fish for every one-hundred hooks. The study says longline fishing boats now might catch one fish per hundred hooks.
The scientists say industrial fishing can destroy groups of fish much faster than in the past. The study suggests that whole populations can disappear almost completely from new fishing areas within ten to fifteen years.
Ransom Myers of Dalhousie University in Nova Scotia led the study with Boris Worm of Dalhousie and the University of Kiel in Germany. Mister Worm says the destruction could lead to a complete re-organization of ocean life systems. Mister Meyers says the decreased number of large fish is not the only worry. He says even populations that are able to reproduce do not get the chance to live long enough to grow as big as their ancestors(祖先). He says not only are there fewer big fish, they are smaller than those of the past.
American government scientists say even with the best efforts to protect fish populations, decreases are to be expected.
【小题1】Where is the passage probably taken from?

A.A story book.
B.A business magazine.
C.An environment report.
D.An economic survey.
【小题2】Big fish have gradually been disappearing especially because ________.
A.longline fishing method is used
B.sea water is getting polluted
C.mankind destroys the environment
D.governments don’t make the best efforts
【小题3】Which of the following shows the fact that the populations of large fish have dropped?
A.Today’s “large”fish are smaller than those of the past.
B.Longline boats now might catch fewer fish every one-hundred hooks.
C.Fish even able to reproduce don’t have the chance to live longer.
D.Japanese boats could catch about ten fish for every 100 hooks.
【小题4】What can be the best title?
A.Discoveries Canadian Scientists Have Made
B.Japanese Fishing Industry
C.Losses of Big Fish
D.Modern Fishing Methods
【小题5】When did the researchers begin to survey the decreasing of large fish?
A.In the 1960s.B.In the 1970s.C.In the 1980s.D.In the 1990s.


Until a century ago, bloodletting was used to treat many ailments. Dating back to before the time of Christ, the treatment involved letting a type of worm, called a leech, such blood from the patient. People believed that there were liquids called humors in the body and that these determined a person’s personality and heath. Bloodletting, they thought, restored a balance to these humors.
At the time, little was known of the working of the human body, but people did know that the same liquid, blood, flowed throughout everyone’s body. They knew it was a vital substance, for loss of any great amount of it meant certain death. Thus, they concluded that all diseases were carried in the bloodstream, and that if the body was relieved of bad blood, heath would return. Bloodletting, however, came to be used as a cure-all. Woman were bled to keep them from blushing while members of the clergy were bled to prevent them from thinking sinful and worldly thoughts.
From the 11th to the 18th centuries, barbers were the people to go to if you needed to be bled. This custom explains the significance of the traditional barber’s pole: the white stripes stand for bandages and the red stripe for blood.
1. This passage is concerned about            .
healthy people and doctors                         B. bleeding as a cure-all
C. barbers of long ago                                      D. leeches with special jobs to do
2. The red and white stripes on barber pole symbolize         .
sin and redemption                             B. the bleeding form
C. women who are nurses                                  D. humors in the body
3. Why is bloodletting no longer considered a cure-all?
Because more is known about the workings of the human body.
Because leeches were outlawed
Because barbers were too busy cutting hair.
Because today we know that blood is necessary for health
4. In the second paragraph, the word “Thus” could be replaced by the word       .
A. When                        B. However                  C. If                            D. So
5. Ailments means           .
A. cures                         B. women                     C. disease                     D. medicines

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网