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问题 实验题

小王用如图所示装置在做“观察水的沸腾”的实验。

（1）指出他所用装置中的错误之处是：________________；

（2）纠正错误后，进行正确操作时记录的数据如下表：由表中数据可知，此时水的沸点是_______℃；

（3）水沸腾后小王加大洒精灯的火力，水温会_________（填“升高”“不变”“下降”） ，若将洒精灯撤去，水不再沸腾，说明沸腾过程需要____________

（4）如他将该装置搬到山顶上做，他将会有什么新的发现____________。

答案

（1）温度计的玻璃泡接触到容器的底部

（2） 99

（3）不变；吸热

（4）水的沸点降低

问答题

Some of the most popular attractions across America are the many free concerts offered to the public throughout the year. These involve not only amateur performers, but professional artists as well. The public parks of many cities across the country usually have bandstands and large lawns. As a service to citizens, they rent out space to performers free of charge. Amateur groups, with nothing more than a desire to perform, offer their talents freely to the public. Semi. professional artists are pleased to get the chance to perform before the public to perfect their craft and nurture the hope of being discovered before beginning a professional career. Famous professionals also give free concerts to make contact with their admiring fans. Often such concerts are sponsored by a large corporate organization and offered to the public free of charge as a cultural service and support for the arts.
The free concerts feature all kinds of music from rock and roll, jazz, country-western to the classics. In addition, free performances may include the plays of Shakespeare or experimental theater of modem dramatists. In New York’s Central Park there has long been a summer Shakespeare festival which draws huge crowds to the free performances.
Of these concerts the ones held on a summer evening in the park are the most popular. They take on a festive air. Friends and groups gather together after work and spread out a blanket on the lawn facing the performers’ stage. The early comers get the best locations and enjoy a picnic supper while it is still daylight. The free seating is on a first come basis. Therefore, by the time the concert begins, as many as five thousand or more people may be in attendance. The concerts usually begin at 8 p. m. and are performed under the stars. The sound is made sufficiently loud SO that no matter where one chooses to sit, he Can hear very well. The only disturbance may be the sound of an overhead airplane on its final approach to an airport or the far-off siren(警笛声) of all ambulance on its way to the hospital. This matters little! What counts is to soak up the atmosphere created by the music and to be with friends in the flesh open air. The best part of it all is that it’s free !
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单项选择题 A3/A4型题

患儿男，生后2天，出生体重为2400g。因吸入性肺炎入院，入院时患儿呼吸急促，口唇稍发绀。即置于辐射保暖床上抢救。

该患儿吸氧的流量应选择每分钟为（）

A.1L

B.2L

C.3L

D.4L

E.5L
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