300年前，意大利科学家做了这样一个实验：在房间里挂了许多铃铛，然后让蝙蝠在房间中自由飞翔．第一次未对蝙蝠有任何限制，铃铛未响；第二次蒙住蝙蝠的眼睛，铃铛也未响；第三次塞住蝙蝠的耳朵，房间中的铃铛响了．下列问题不是该实验所研究的是（ ）
A．蝙蝠飞行靠什么躲避障碍物的
B．眼睛对蝙蝠飞行是否起作用
C．耳朵对蝙蝠飞行是否起作用
D．铃铛是怎样发声的
A、通过第一次、第二次和第三次实验可以研究蝙蝠飞行靠什么躲避障碍物的．故A选项是该实验所研究的．
B、通过第一次和第二次的实验可以研究眼睛对蝙蝠飞行是否起作用．故B选项是该实验所研究的．
C、通过第一次和第三次实验的可以研究耳朵对蝙蝠飞行是否起作用．故C选项是该实验所研究的．
D、铃铛是怎样发声的本题并未涉及，故D选项不是该实验所研究的．
故选D．
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| Here are some accidents which often happen to children: ◆ Scald (烫伤)-Small children don't understand that hot water and hot drinks can be dangerous. Adults often forget the danger, too. It only takes a cup of tea or coffee, or a bath that's too hot to scald a child badly. ◆Falls-Children of all ages fall and hurt themselves from time to time. For babies, the danger is rolling off the edge of something, like beds, chairs or tables. For babies of two to four, climbing on furniture doesn't seem dangerous. It's just fun. But it's very easy for them to fall off a piece of furniture, down the stairs, out of a window or off a balcony (阳台). ◆Burns-Many children die in house fires and more are badly burnt. A cigarette (香烟) can easily start a fire. A child can also be burnt by a hot iron or matches. ◆Cuts-Class causes the most serious cuts. So do broken bottles, doors or windows. | ||||
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