[单项选择]Why could not ceramics be used widely in the past

[单项选择]With more knowledge, the reporter could have used an outside phone to ______.
A. rob other companies
B. damage the computer
C. obtain more facts
D. steal from banks

[单项选择]Jim could not promise anything. Why

[单项选择]

Human cloning(克隆) technology could be used to reverse heart attacks. Scientists believe that they may be able to treat heart attack victims by cloning their healthy heart cells and injecting them into the areas of the heart that have been damaged, and other problems may be solved if human cloning and its technology are not forbidden.
·With cloning, infertile couples could have children. Current treatments for infertility, in terms of per- (百分比), are not very successful. Couples go through physically and emotionally painful procedures for a small chance of having children. Many couples run out of time and money without successfully having children. Human cloning could make it possible for many more infertile couples to have children than ever be- fore.
·We should be able to clone the bone marrow(骨髓) for children and adults suffering from leukemia (白血病), This is expected to be one of the first benefits to come from cloning technology.
·W
A. the treatment of heart attacks
B. the bearing of babies
C. the cure of blood diseases
D. the detection of gene-related diseases

[单项选择]According to the passage, MSR-1 could be used for______.
A. making inside-eye observations
B. carrying out operations on human eyes
C. cutting off brain tumors
D. both B and C

[单项选择]Why was electronic mail unsuccessful in the past

[单项选择]Why did the narrator go past Sheftel's
A. He was looking for a gift for his niece.
B. He wanted to buy some stationery.
C. He was on his way to work.
D. He was window-shopping.

[单项选择]The material in the passage could best be used in an argument for ______.
A. increased funding for research on amorphous materials
B. further study of the history of silicon crystals
C. increased reliance on solar energy
D. training more scientists to study energy problems

[单项选择]Why is electronic mail widely used in business
A. Because it can speed up the sending of messages.
B. Because it is a fashionable gadget to the businessman.
C. Because it is cheap and efficient.
D. Because it is a part of business life.

[单项选择]Why could not people use stamps for many times


A. Because the stamps would be taken away when they had been used.
B. Because the stamps would be torn up (撕碎) when they had been used.
C. Because the stamps would be put on seals by the post office.

[单项选择]Why could McDonald influence the grow of the fruits
A. Because McDonald will supervise the process of fruits growing.
B. Because more high-quality fruits are needed to make nutritional McDonald food.
C. Because McDonald is going to run an orchard itself.
D. Because how the fruits are grown matters the cost of McDonald food.

[单项选择]Why could maglev trains replace short-fight commuter aircraft
A. Maglev trains are faster.
B. Maglev trains are cheaper.
C. Maglev trains are more fuel-efficient.
D. Maglev trains are safer.

[单项选择]Why could maglev trains replace short-flight commuter aircraft
A. Maglev trains are faster.
B. Maglev trains are more fuel-efficient.
C. Maglev trains are cheaper.
D. Maglev trains are safer.

[单项选择]Why are horses used to catch the electric eels
A. to frighten the eels.
B. to exhaust the eels.
C. to attract the eels.
D. to stir the water.