天然气中不含有硫化物，因此燃烧后不排放有害气体。(）

任务型阅读

       Saying no can be very difficult. People who are very shy often have little confidence. It is very hard for them to say no. They would feel shy when they say no, but doing things that they don't want to do will make them unhappy.

       A simple and direct "No" is the best way. If you want to explain, you can keep it simple. Just say, "No, I've already made plans for this time" or "No, I'm not free at that time."

       Other indirect but polite ways of saying no:

       ● Sorry, I can't do this right now.

       ● I'm afraid I can't, but thank you for asking.

       ● Please accept (接受) that I cannot come.

       ● I'd rather not.

       To say no you should:

       ● Start the sentence with the word "No".

       ● Shake (摇晃) your head when you say no to make sure others understand. Your voice should be clear and direct.

       Sometimes it is difficult to say no. You can try to reply and explain in the following way:

       "Sorry. I would have taken care of your cat next weekend, but I will be going out. I know it will be hard to find someone to take care of the cat. I will try to help you next time." Remember that: you have the right (权利) to say no!

根据短文内容，回答下列问题。

1. Who usually have trouble saying no according to the passage?

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2. How can indirect ways of saying no sound?

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3. When you really want to say "No", how should you make your voice?

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4. What does the writer encourage us to do?

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5. When it is really difficult to say no, what are you supposed to try to do?

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下列风险中．属于建筑工程保险责任的是（）。

A.因意外事故造成邻近地区第三者人身伤害或财产损失

B.错误设计引起的损失、费用和责任

C.原材料缺陷或工艺不善引起的保险财产本身的损失

D.全部停工或部分停工引起的损失、费用或责任

舌苔厚腻为积粉者多为（）

A.痰饮内停

B.食积停滞

C.湿浊蕴脾

D.痰湿化热

E.时邪挟湿

在TD-SCDMA网络优化工具中，关于UE测试说法正确的是（）

A.在漏配邻区情况下，UE同样可以对漏配的邻小区进行测量，不好影响其正常测试

B.UE测试小区是由系统消息下发邻区包含的小区

C.采用UE往往不能确定某小区是否有功率发射还是存在其他网络问题导致UE无法收到下行功率

D.导频污染是采用UE测试数据作为辅助参考

简述经典性条件反射的形成。