问题 问答题

用酒精灯给试管中的固体药品加热,实验结束后,发现试管破裂,分析可能的原因.

答案

实验室里给固体药品加热时,试管破裂可能是由于试管受热不均匀,也可能是在高温时突然冷却等引起的.如试管没有预热,就直接加热会造成试管受热不均匀;加热时试管外壁有水,导致加热时试管受热不均而炸裂试管;试管底部接触到灯芯导致试管受热不均炸裂;试管口没有向下倾斜,造成生成的水倒流到试管底部炸裂试管;刚加热完的试管立刻用冷水清洗等.

故答案为:①没有给试管均匀预热;

②试管外壁有水滴;

③试管口没有略向下倾斜

④用焰心给试管加热

⑤刚加热完的试管立刻用冷水清洗.

阅读理解

Chinese New Year Celebration is the most important celebration of the year. Chinese people may celebrate the Chinese New Year in slightly different ways but their wishes are almost the same; they want their family members and friends to be healthy and lucky during next year.    

Chinese New Year Celebration usually lasts for 15 days. Celebratory activities include Chinese New Feast, firecrackers, giving lucky money to children, the New Year bell ringing and Chinese New Year Greetings. Most of Chinese people will stop the celebrating in their home on the 7th day of New Year because the national holiday usually ends around that day, however celebrations in public areas can last until the 15th day of New Year.

It is the money given to kids from their parents and grandparents as New Year gift. The money is believed to bring good luck, ward off monsters; hence the name "lucky money". Parents and grandparents first put money in small, especially-made red envelopes and give the red envelopes to their kids after the New Year's Feast or when they come to visit them on the New Year. They choose to put the money in red envelopes because Chinese people think red is a lucky color. They want to give their children both lucky money and lucky color.

小题1:What can we learn from the Paragragh 1?

A.Chinese New Year Celebration is one of the most important celebrations in China

B.Chinese New Year Celebration can bring luck to them during the next year

C.Some different celebrations still exist

D.Kids can get their lucky money during the Chinese New Year Celebration小题2:Where can we meet some celebrations in the 13th day of the New Year in China?

A.Wal-Mart Stores

B.Your uncle’s family

C.Yuanmingyuan Imperial Garden

D.High school小题3:Which way is not mentioned in the passage below to celebrate New Year?

A.Set off fireworks

B.Come over relatives

C.Receive presents

D.Get lucky money小题4:Where can we probably find the passage?

A.A travel brochure

B.A newspaper

C.A tradition guide

D.A textbook

多项选择题