判断题：造成渣口连续破损的主要原因是放渣操作失误引起的。

题型：阅读理解

阅读理解

Dear Wang Lin,

It's a good idea to bring a small present when you go to a dinner party. Flowers are always nice or

you may bring a bottle of wine if you know that your friends drink it. You should arrive on time or five to

ten minutes late. Don't get there early. If you're going to be more than fifteen minutes late, you should

call and tell them.

Try to be free at the dinner table. If you don't know about choosing the right fork or knife, just watch

the other people, and follow them. If you still have no idea of what to do, ask the person next to you.

If you like the food, say so. Of course, you'll thank them for the meal and for their kindness. It's also

a good idea to send a thank you card the day after.

Yours,

Rose

1. Wang Lin wants to .

A. make friends with Rose

B. know some social customs for a dinner Party

C. make her friends happy

D. give her friends a surprise

2. Rose is possibly .

A. a good housewife

B. a TV hostess(主持人)

C. a member of the dinner party

D. a friend of Wang Lin's

3. If you're asked to a dinner party but not sure about what to bring as a present, it'sgood to bring .

A. some fruits

B. a bottle of wine

C. some flowers

D. a knife and a fork

4. Which of the following is NOT proper(适当的) for joining in a dinner party?

A. Get there 15 minutes earlier.

B. Make yourself at home.

C. Follow others to use forks and knives.

D. Thank your friends for the meal.

5. From the letter we've learned that it's very to know something about American social customs.

A. difficult

B. friendly

C. enjoyable

D. helpful

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题型：解答题

设函数f(x)=x2-aln(2x+1)(x∈(-

1

2

，1)，a＞0)
（1）若函数f（x）在其定义域内是减函数，求a的取值范围；
（2）函数f（x）是否有最小值？若有最小值，指出其取得最小值时x的值，并证明你的结论．

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题型：不定项选择

把标有“6V 3W”的小灯泡与最大阻值为100Ω的滑动变阻器连接在电源电压恒为18V的电路中，各电表选择的量程如图所示，要求闭合开关后两电表的示数均不超过所选量程，且灯泡两端电压不允许超过额定值（灯丝电阻不变）．下列说法正确的是

[ ]

A．在滑动变阻器滑片向左移动的过程中，电流表示数变大，电压表示数变大

B．滑动变阻器允许调节的范围是24Ω～60Ω

C．小灯泡的电功率最小值为0.75W

D．电路的总功率最大值为10.8W

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题型：单项选择题

提高公民科学素质，对于增强公民获取和运用科技知识的能力、改善生活质量、实现全面发展，对于提高国家自主创新能力、建设（）国家，实现经济社会全面协调可持续发展、构建社会主义和谐社会，都具有十分重要的意义。

A.节约型

B.和谐型

C.创新型

D.科技型

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题型：判断题

煤尘的挥发分越高，爆炸的危险性就越小。

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造成渣口连续破损的主要原因是放渣操作失误引起的。

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