Large quantities of information,as well as some timely help　　　 since the organization was built.

A.has offered　　　　 B.had been offered

C.have been offered　　 D.is offered

I want to use the same tools _______used in your factory a few days ago.

A. as was 　　B. which was 　　C. as were 　　D. which

Many young people don’t work hard, and regret it later when the opportunity is gone. They only realize it _______ it is too late.

A. when　　 B. before　　 C. in case　　 D. until

They _________ on the program for almost one week before I joined them, and now we are still working on it as no good results have come out so far.

　 A．have worked　　　　　　　 　 B．had worked

　 C．have been working　　　　　　 D．had been working

In ________ (通常), cars of this kind are reliable and breakdowns are rare.

The new tax policy only affects people on yearly incomes over￥120,000,　　　 the very rich. w*A.by the way　 B.as a result　 C.in other words　 D.as a maner of

Maybe if I _____ science, and not literature then, I would be able to give you more help.（ ）

A. studied　　 B. would study　 C. had studied　 D. was studying

I to1d Sally how to get here，but perhaps I　　　 it out for her．

　 A．had to write B．must have written C．should have written D．ought to write

What will people die of 100 years from now? If you think that is a simple question, you have not been paying attention to the revolution that is taking place in bio-technology(生物技術(shù)). With the help of new medicine, the human body will last a very long time. Death will come mainly from accidents, murder and war. Today's leading killers, such as heart diseases, cancer, and aging itself, will become distant memory.

　 In discussion of technological changes, the Internet gets most of the attention these days. But the change in medicine can be the real technological event of our times. How long can humans live? Human brains were known to decide the final death. Cells(細(xì)胞) are the basic units of all living things, and until recently, scientists were sure that the life of cells could not go much beyond 120 years because the basic materials of cells, such as those of brain cells, would not last forever. But the upper limits will be broken by new medicine. Sometime between 2050 and 2100, medicine will have advanced to the point at which every 10 years or so, people will be able to take medicine to repair their organs(器官). The medicine, made up of the basic building materials of life, will build new brain cells, heart cells, and so on---in much the same way our bodies make new skin cells to take the place of old ones.

　 It is exciting to imagine that the advance in technology may be changing the most basic conditional human existence, but many technical problems still must be cleared up on the way to this wonderful future.

1. According to the passage, human death is now mainly caused by _______.

A. diseases and aging　　　　　　　 B. accidents and war

C. accidents and aging　　　　　　　 D. heart diseases and war

2. In the author's opinion, today's most important advance in technology lies in _____.

A. medicine　　 B. the internet　　 C. brain cells　 D. human organs

3. Humans may live longer in the future because ______.

A. heart disease will be far away from us

B. human brains can decide the final death

C. the basic materials of cells will last forever

D. human organs can be repaired by new medicine

“Things _________ never come again!” I couldn’t help talking to myself.

A. lost　　　　　　　　 B. losing　　　　 C. to lose　　　　　 D. have lost