问题
选择题
某学校化学课外活动小组的同学，取刚降到地面的雨水的水样，用pH计（测pH的仪器）每隔10分钟测一次pH，其数据如下表所示，其中雨水酸性最强的时刻是：
A．9：00
B．9：10
C．9：20
D．9：30
答案
答案：D
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某学校化学课外活动小组的同学，取刚降到地面的雨水的水样，用pH计（测pH的仪器）每隔10分钟测一次pH，其数据如下表所示，其中雨水酸性最强的时刻是：
A．9：00
B．9：10
C．9：20
D．9：30
答案：D
Computer games are very popular. It is natural for people to want to _21___ , so playing against a computer or against a friend on the computer can be __22__to stop. “ Just one more game, ” often turns into another game, then another. Computer games do have their _23__. They are excellent for training hand or eye coordination(协调).Surgeons (外科医生)_24____played computer games as children are often skilled. Computer games can __25__ be great for teaching students. The students are open to learning while playing. They can study for longer than a teacher would be able to teach. But like anything __26__ in life, things should be balanced.(平衡).Too much time on the computer can _27__ your eyes. Regular breaks are needed. If students cannot _28__ playing computer games, they won’t do as well in other areas in their life—not just schoolwork, but in developing important social skill such as how to talk with people and how to work with others. And if they are no longer taking regular exercise, __29___ health will become worse. Computer games have their place, __30___people must also remember it is important to have a balanced lifestyle.
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