问题
选择题
小明在实验室过滤一杯浑浊的河水，除滤纸外，还需要使用的仪器是（ ）
A．①②④⑤
B．②④⑤⑦
C．②③⑥⑦
D．④⑤⑥⑦
答案
小明在实验室过滤一杯浑浊的河水，除滤纸外，还需要使用漏斗、玻璃棒、烧杯、铁架台等仪器．
故选B．
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小明在实验室过滤一杯浑浊的河水，除滤纸外，还需要使用的仪器是（ ）
A．①②④⑤
B．②④⑤⑦
C．②③⑥⑦
D．④⑤⑥⑦
小明在实验室过滤一杯浑浊的河水，除滤纸外，还需要使用漏斗、玻璃棒、烧杯、铁架台等仪器．
故选B．
Is the world really going mad? 1._____day I was sittng in a restaurant 2._____ a quick drink and a talk with a few friends when it suddenly 3._____ me that almost everyone in the restaurant was smoking. It wasn’t long 4._____ the whole room was 5._____ with smoke. I asked with an apology for 6._____ to open a window to stop myself 7._____! Nowadays air pollution is something that hardly question any more. However, I still can’t walk down the street in any of the big cities without 8._____ that people are 9._____ the air pollution. It is time for the government departments of the world to introduce emission(废气排放) controls on all cars and 10._____ the public transport system(公共交通体系) to encourage people to 11._____ their cars at home. A friend of mine takes flying lesson each morning and it really makes him 12._____ when he climbs above the smog layer(烟雾) and looks down 13._____ it and thinks: “I’m breathing that!” This kind of 14._____ results from the bad management of resources. Waste things can 15._____ should, be treated properly. House building, road 16._____, and industrial development are all earthmoving(or earth-reducing) operations and can change the balances of 17._____ created over millions of years. I would like to 18._____serious studies done on all these main works before they are built. Also, there should be 19._____ national parks set up to keep the most beautiful parts of our countries in their natural 20._____. 小题1:.
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