题目内容
硝酸的沸点低于水的沸点,是因为硝酸分子内形成分子内氢键,而水只形成分子间氢键。
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将浓硫酸与少量KI固体混合,还原产物主要是H2S。
I. Complete the following sentences with correct prepositions.1. David is so upset. What happened _________ him?2. She has nothing to complain __________, does she?3. News that he broke the world record was quickly broadcast __________ the country.4. They are careful ___________ what they eat and exercise regularly.5. The word “write” has the same pronunciation __________ the word “right”.
II. Complete the following sentences with the correct form of the given words.1. A person who deceives and betrays his motherland is ____________ (patriotic) and very disgraceful in his own country and in the world.2. He looked out of the window every morning and saw nothing but ___________ (misery) weather and storms.3. The shop _________ (own) is good at communicating with customers.4. ___________ (short) after she recovered from the illness, she lost her job and had to go through another difficulty in life.5. _____________ (fortune), everything worked out all right in the end.
《内蒙组曲》创作于哪一年
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