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问题 单项选择题

关于先天性卵巢发育不全综合征的治疗是（）

A.单用人生长激素

B.确诊后先用雌激素，到成年后加入生长激素

C.单用雌激素

D.确诊后立即应用人生长激素+雌激素

E.确诊后即用人生长激素，到骨龄达12岁以上时加雌激素

答案

参考答案：E

填空题

首字母填空。

1. I'm sure she is h_______ with me although I met her for the first time.

2. The poor girl was kneeling on the ground, begging money from the p______.

3. You'll get an e_______ gift if you buy something during the Christmas.

4. Even the medium can play j______ on the president on April Fools' Day.

5. The Internet games are a_______ to some young people.

6. The former USSR (苏联) b______ up many years ago.

7. The assistants of the library are s_______ out the books.

8. Chinese government will always s_______ to the policy to reform and open

   up to the world.

9. The f______ music is very familiar among the villagers.

10. The boy sings so well that he dreams of being a m_______ tomorrow.

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解答题

某摩托车生产企业，上年度生产摩托车的投入成本为1万元/辆，出厂价为1.2万元/辆，年销售量为1000辆．本年度为适应市场需求，计划提高产品档次，适度增加投入成本．若每辆车投入成本增加的比例为x（0＜x＜1），则出厂价相应的提高比例为0.75x，同时预计年销售量增加的比例为0.6x．已知年利润=（出厂价-投入成本）×年销售量．

（1）写出本年度预计的年利润y与投入成本增加的比例x的关系式；

（2）为使本年度的年利润比上年有所增加，问投入成本增加的比例x应在什么范围内？
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