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问题 单项选择题

农药经水污染食品的重要途径是通过

A．增加水的污染度

B．在水中扩散

C．在水中生物降解

D．在水中生物浓缩

E．在水中生物合成

答案

参考答案：D

解析：农药经水污染食品的重要途径是通过在水中生物浓缩。

填空题

12是12的______数，也是12的______．
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单项选择题

Many people are wondering if it is safe to talk on the phone while driving. There have been quite a few accidents while drivers were talking on the phone. Some research is being done to find out if driving while talking on the phone is dangerous.
When there is a car accident police officers will find out if any of the drivers were using a cell phone. They will write this information in a report. The information will be saved and later studied.
There have been some very bad car accidents caused by drivers being distracted by cell phones. Drivers sometimes forget to watch the road carefully when they are using their phones. Not paying attention to the road can be dangerous, even deadly.
It is important for drivers to focus on the road. They need to pay attention to what is going on around them. They might need to stop or swerve quickly.
People want to make sure that the roads are safe for everyone. Studies will be done using the information police officers collect at accidents. Maybe someday this information will lead to laws about driving and using cell phones.

What will police officers do after a car accident9 They will ______

A．send the driver to the hospital

B．check how seriously the car is damaged

C．do the research on the car accident

D．find out if a cell phone is used
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