属于三级预防 A．改变工艺，改变原材料和设备 B．定期职业性健康检查 C．使用优质原
题型：单项选择题
问题：
属于三级预防
A．改变工艺，改变原材料和设备
B．定期职业性健康检查
C．使用优质原料、保证产品质量
D．对已患病者正确诊断，及时处理，积极治疗
E．毒代动力学研究
题型：单项选择题
阅读理解。
Every year, the Wilsons go to the beach for a week vacation. There are
many interesting things to do at the beach.
The children play games on the sand. Sometimes they build sandcastles.
There are saltwater (海水) swimming pools. The children can swim safely in
these pools and the water is always clean.
There is an esplanade (游逛的广场). This is a long road by the beach,
They are many cafes and restaurants on the esplanade. There is also an
amusement (娱乐) park beside the beach. This is a place with many kinds of
rides.
The Wilsons always stay at the same hotel. They usually have the same
rooms. These rooms are at the front of the hotel. There is a good views(风景) of the ocean (海洋) from their windows, The children are a little sad when
the vacation is over because they don't want to go home.
根据短文内容完成下列各小题.
1．How often do the Wilsons go to the beach for vacation every year?
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2．Where can the children swim safely?
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3．Can visitors drink or eat on the esplanade ?
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4．Why do the Wilsons stay at the front of the hotel ?
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5．How do the children feel when the vacation is over?
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