队列的插入操作在　　【3】　　进行，删除操作在队头进行。

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.

有一容器在相同条件下分别充满氢气、空气、二氧化碳气体．

（1）所盛气体的质量由大到小的顺序是______；

（2）理由是______．

为防止某些发电机组因检修或故障停机影响电力网的正常运行，在电力系统中应至少有（）的备用容量。

A、10%~15%

B、10%~20%

C、15%~20%

D、5%~15%

患者，男性，35岁，1拔除后3个月，要求烤瓷固定桥修复。经检查量2|1牙根均较长，均为活髓，可以作为固定桥基牙

基牙预备时，为保证美观和冠边缘的强度，唇侧肩台的宽度一般应为（）。

A.0.5mm

B.1mm

C.1.5mm

D.2mm

E.2.5mm

可燃固体着火，也称（），特点是（）。一旦条件具备，易（），主要用是（）来扑灭。