Questions 17 through 20 are based on the following conversation.1.
2.
3.
4.
| A．Computer problems. | B．Computer-related crimes. |
| C．Healthcare. | D．Computer-related injuries and problems. |
| A．Not mentioned. | B．Not too close. |
| C．Half a meter away. | D．About an arm’s length away. |
| A．Having a good chair. | B．Keeping your feet flat on the floor. |
| C．Crossing one’s legs. | D．Keeping arms and hands relaxed on the keyboard. |
| A．There are not so many physical problems despite the wide use of computers. |
| B．A good chair enables people to keep their feet flat on the floor. |
| C．Dr. Kwan’s advice is given to those who suffer from computer-related injuries. |
| D．People should avoid sitting in front of computers for too long without walking around. |
更新时间：2018-12-27 17:42:52
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