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问题 选择题

2013年国庆长假期间，旅游景区的餐饮因游客剧增而价格大涨。这反映了（   ）

A．价格受供求影响而波动

B．竞争使价格总量上涨

C．价格在本质上是由供求决定的

D．景点商品价值量大

答案

答案：A

题目分析：价格由价值决定，受供求影响。C本身说法错误；旅游景区的餐饮因为游客剧增，需求量增加，使得价格大涨，说明价格受供求影响，供不应求时，价格升高，A正确；BD说法错误。

填空题
用方框中所给词或短语的适当形式填空。（方框中有两个是多余的）
Five times  Saturday  beach  keep  and  hardly ever
Although  them   for   unhealthy   or  eating habit
       How often do you eat chocolate and chips?  1   a week? That's a bad   2  ! Every day we eat a lot of
  food. Some are good   3   0ur health, and some are bad for our health. What's good food? Here is a
  food pyramid (金字塔). Every day, we should eat much bread and rice; we should eat some vegetables
  _4   fruit, maybe two apples or three oranges. A lot of bread, rice, vegetables and fruit help you _5   in
  good health. We should have one glass or two glasses of milk and less fish, meat, chicken   6   eggs.  Of
  course, we should   7   eat junk food.   8   sweets and cola are very delicious, we can't often eat   9  .
  They're  10  food.
1. _________2. _________3. _________4. _________  5. _________
6. _________7. _________8. _________9. _________10. _________
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填空题

在等差数列｛an｝中，a1＞0，a5=3a7，前n项和为Sn，若Sn取得最大值，则n=    .
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