3. From the passage we know that ammonium nitrate is a kind of _____.

　　A. natural gas, which can easily catch fire

　　B. fertilizer, which can't be stored in a great quantity

　　C. poisonous substance, which can't be used in overcrowded areas

　　D. fuel, which is stored in large tanks

　　4. From the discussion among some experts we may conclude that _____.

　　A. to avoid any accident we should not repair the facilities in chemical industry

　　B. the local authorities should not be concerned with the production of the

　　chemical industry

　　C. all these accidents could have been avoided or controlled if effective measures

　　had been taken

　　D. natural gas stored in very large tanks is always safe

　　【参考答案】1—4、BDBC

　　四、七选五

　　(2015·广西省桂林市、防城港市联合调考)

　　One of the most popular vacation destinations for young families is the home of relatives. __1__ Here are some tips for making sure you are invited back again.

　　Be considerate

　　Every family has their own way of doing things. Keep these things in mind when you're visiting.

　　If your host family are early to bed and early to rise, don't keep them up talking until one o'clock in the morning.

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