下颌第一磨牙髓室顶最凹处位于A．冠中1/3 B．冠颈1/3 C．颈缘 D．根颈1/3

Paris is the capital of France. Its subway is also very special. You can enjoy its culture when you are in this city. First you can see many people reading books in the subway. Whenever they are in the subway or at the station, there is always a book in the hand.

The subway station in Paris is not big, but each of them has its special facts. Some stations look like ships. Some stations have clothes, caps and shoes. And every station has a big advertisement picture. But many of them are for selling clothes and cosmetics(化妆品).

You can meet some beggars(乞丐) in the subway. But the beggars in the Paris subway are also very special. They often play the violin or guitar in the train. They don’t feel shy at all. Instead they think it is natural. After playing, they will go around the train and ask you to give them some money.

If you want to learn more about Paris, go to the subway and enjoy its culture by yourself.

小题1: What do many people usually do when they are in the subway?

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A．Listen to music.

B．Beg some money.

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C．Sell clothes and cosmetics. 

D．Read books.小题2: How do the beggars get money from people in the subway?

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A．They often play the violin or guitar in the train.

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B．They usually brush shoes for the passengers.

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C．They often steal money from the shops.

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D．They usually help the passengers carry suitcases.小题3: What’s the main idea of this passage?

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A．Reading in the Paris subway.

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B．The subway is a window of the Paris culture.

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C．The beggars in the Paris subway usually have some skills.

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D．Each of the subway station in Paris has its special facts.

使用电动台钻钻孔时，必须根据（），采用不同的加持方法。

A、现场实际

B、工件材质

C、设计要求

D、不同工件

化学源于生活，生活中蕴含着许多化学知识．

（1）醋酸具有挥发性，打开盛装醋酸的瓶盖，会闻到酸味，这是由于分子具有______的性质，醋酸的pH______7（填“＞”、“＜”、“=”）．

（2）用洗涤剂清洗油污，是利用了洗涤剂的______作用．

（3）有些牙膏中添加有少量NaF，刷牙时NaF与牙齿中的矿物质羟基磷灰石[Ca₅（PO₄）₃OH]反应生成氟磷灰石[Ca₅（PO₄）₃F]和另一种物质X，氟磷灰石具有良好的抗酸作用，从而达到防止龋齿的作用．反应的化学方程式是Ca₅（PO₄）₃OH+NaF=Ca₅（PO₄）₃F+X，则X的化学式为______，该反应属于______反应（填“化合”或“分解”或“置换”或“复分解”）．一个羟基磷灰石[Ca₅（PO₄）₃OH]分子中含有______个氧原子．

倡议书可以宣读，可以张贴，也可以报载。

根据《固体废物污染环境防治法》的规定，造成固体废物严重污染环境的，由按照国务院规定的权限决定限期治理。

A、各级人民政府

B、各级环境保护部门

C、所有具有环境监督管理权的部门

D、治理单位的上级主管部门