阅读理解。
     Will Chips One Day Be Planted In Our Bodies For Identification?
     A US doctor has planted under his skin a computer chip (芯片)that can send personal information to
 a scanner (扫描仪). It's a technology that may someday be widely used as a way to identify (识别)
 people. 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 (跟踪) and identify them.
     The doctor decided to test the chip himself after the World Trade Center disaster (灾难). The dead
 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 or
  other body parts. The idea is that the chip will provide immediate and correct medical information when it
  is needed.
     The information can contain (包括) 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 (专家) said the product raises new questions about the
 relationship between humans and computer technology and could cause problems if it is used against some
 one's wishes, or if your personal information is read by those who should not see it.
1. According to the passage, computer chips have already been used to _____.
    A. catch escaped prisoners
    B. find missing children
    C. follow lost animals  
    D. treat sick people
2. The doctor decided to test the chips himself because he believed that _____.
    A. nobody would dare to try it
    B. they can be used for identification purposes (目的)
    C. it has been proved successful on animals
    D. his patients expected him to experience it first
3. Which of the following statements is best supported by the text?
    A. This chip has been proved to be very successful.
    B. The use of this chip will be favored by everybody.
    C. There will be a great market for chip planting in humans.
    D. Doctors will make good money by using chips.
4. What problem may be caused by planting chips in the human body?
    A. People will be controlled by computers.
    B. Computers could send out wrong information.
    C. Chips can be the cause of diseases.
    D. Information may be used improperly.