今年我市恢复了初中化学实验操作考试，化学实验既要操作规范,更要保障安全。下列实验基本操作符合这一要求的是
A．给液体加热
B．收集CO2并验满
C．闻气体气味
D．滴加液体
答案：B
题目分析：给液体加热试管中的液体体积不能超过试管容积的三分之一；收集CO2并验满的方法是燃着的木条放在瓶口；闻气体气味应用手煽动，不可直接靠近闻气味；滴加液体时胶头滴管应垂直悬在试管口上方，不可插进试管内部。
点评：关于实验室的基本操作属于中考的必考题型，但是可以考的操作比较有限，应注意总结。
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| Some people say they have an answer to the problems of car crowding and pollution. In many cities, hundreds of people __1__ bikes to work every day. In New York City, some bike riders have even founded a group: Bike for a Better City. They say if __2__ people rode bikes to work, there would be fewer cars and less dirty air. For several years this group had tried to get help for bike riders. They want to have special roads for bikes only, because __3__ bike and cars use the same roads, there may be accidents. Bike for a Better City feel if there were bike roads, more people would use bikes. But __4__ bike roads have been ready yet. Not everyone thinks it is a good__5__. Drivers don't like it, and some shop owners don't __6__ . And most people live __7__ far from the city to travel by bike. Still, __8__ has been done about it. On Saturdays and Sundays, the largest open park in New York is __9__ to cars, and the roads may be used by bikes only, but the group still says this is not enough and goes on fighting __10__ bike roads. | |||
| ( ) 1. A. on ( ) 2. A. fewer ( ) 3. A. until ( ) 4. A. no ( ) 5. A. hope ( ) 6. A. so ( ) 7. A. very ( ) 8. A. everything ( ) 9. A. closed ( ) 10. A. get | B. ride B. less B. for B. only B. way B. and B. quite B. something B. open B. to get | C. by C. many C. when C. some C. help C. neither C. too C. anything C. opening C. ask | D. take D. more D. why D. many D. idea D. either D. so D. nothing D. closing D. to ask |