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问题 单项选择题 A1型题

具有促进根尖钙化、封闭根尖孔作用的根管充填材料是（）

A.氧化锌丁香油糊剂

B.根充糊剂

C.碘仿糊剂

D.氢氧化钙糊剂

E.牙胶尖

答案

参考答案：D

解析：氢氧化钙糊剂具有抗菌抑菌作用，能促进根尖钙化，封闭根尖孔。

完形填空

However, most children are   2           ( face ) with a completely different situation. Most parents fear that games will prevent children from increasing new knowledge and   3           the children will fail in the future examinations. So, instead of   4           ( let ) the children   5           find and learn naturally from their surroundings, they force their children to take part in various kinds of classes, learning English, playing   6           piano or practising drawing, etc. What’s more, some parents put   7           the children’s toys which are very useful in developing children’s imagination and practical abilities.

  8         is a piece of good advice to those parents:   9          you want to expect your child to be able to accomplish something, you must first of all develop his ability to adapt to the new surroundings. That cram education can lead to nothing   10         a failure in the children’s growth.
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单项选择题

目前深圳市天然气管网压力系统包括（）。

A、一级管网

B、低压--中压两级管网

C、低压--中压--高压三级管网

D、以上都不对
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