题目内容：

There is a technology that may someday be widely used as way to identify people.An American  doctor can plant a computer chip under his skin which can send personal information to a scanner.The chip gives off information which will be scanned by a hand-held reader.

The chip is similar to that planted in more than 1 million dogs,cats and other pets in recent years to track and identify them. The doctor decided to test the chip himself after the World Trade Center disaster.He though the dead in the disaster could have been identified if their names and other important information had been chipped .

Officials of the company said they hope to sell the chips to patients with man-made arms or legs. The idea is that the chip will provide immediate and correct medical information when it is needed.

The information can contain name,telephone number and other information.Or it can send out a message that ,when connected to a computer can call up records.The scanner can read it through clothes from over a meter away .The new product also could be used to control prisoners .Workplaces of great importance may want to use the chips for employees,too.Some parents may consider planting chips in young children or elderly relatives who may be unable to say their names,addresses or telephone numbers.

Some medical and technology specialists said the product raises new questions about the relationship between humans and computer technology and could cause problems if it is used against someone's wishes,or if your personal information is read by those who should not see it.

1.In the text,computer chips have already been used to

A.catch escaped prisoners  B. find missing children

C. treat sick people       D. follow lost animals

2.The doctor decided to test the chips himself because

A. nobody would dare to try it

B. the chip could be used for identification purposes

C. the chip had been proved successful on animals

D. his patients expected him to experience it first

3.We can learn from the passage that

A. the chip has been proven to be very successful.

B.The use of this chip will be favored by everybody

C. doctors will make a lot of money by using chips.

D.There will be a great market for chip planting in humans.

4.What problem may be caused by planting chips in the human bodies?

A. Personal information may be used improperly

B.Chips can be the cause of diseases

C. Computers could send out wrong information

D.Sick people will be controlled by computers.