社会主义法制要求的核心是（）。 A.制定法律 B.公正审判 C.强化仲裁的作用 D.

Although April did not bring us the rains we all hoped for, and although the Central Valley doesn’t generally experience the sound and lightning that can go with those rains, it’s still important for parents to be able to answer the youthful questions about thunder and lightning.

The reason these two wonders of nature are so difficult for many adults to explain to children is that they are not very well understood by adults themselves. For example, did you know that the lightning we see flashing down to the earth from a cloud is actually flashing up to a cloud from the earth? Our eyes trick us into thinking we see a downward motion when it’s actually the other way around. But then, if we believed only what we think and we see, we’d still insist that the sun rises in the morning and sets at night.

Most lightning flashes take place inside a cloud, and only a relative few can be seen jumping between two clouds or between earth and a cloud. But, with about 2,000 thunderstorms taking place above the earth every minute of the day and night, there’s enough activity to produce about 100 lightning strikes on earth every second.

Parents can use thunder and lightning to help their children learn more about the world around them. When children understand that the light of the lightning flashing reaches their eyes almost at the same moment, but the sound of the thunder takes about 5 seconds to travel just one mile, they can begin to time the interval (间隔) between the flash and the crash to learn how lose they were to the actual spark (闪光).

小题1:According to the author, in the area of the Central Valley____.

A．rains usually come without thunder and lightning.

B．it is usually dry in April

C．children pay no attention to the two natural wonders.

D．parents are not interested in thunder and lightning.小题2:We believe that lightning is a downward motion because_______.

A．we were taught so by our parents from our childhood.

B．we are taken in by our sense of vision.

C．it is a common natural sight.

D．it is a truth proved by science.小题3:What is TRUE about lightning according to the passage?

A．Only a small number of lightning flashes occur on earth.

B．Lightning flashes usually jump from one cloud to another.

C．Lightning travels 5 times faster than thunder.

D．There are far more lightning strikes occurring on earth than we can imagine.小题4:The underlined word “activity”  is most closely related to the word (s) _____.

A．cloud

B．lightning strikes

C．lightning flashes

D．thunderstorms小题5:It can be concluded from the passage that _______.

A．we should not believe what we see or hear.

B．things moving downward are more noticeable.

C．people sometimes may have wrong ideas about ordinary phenomena.

D．adults are not as good as children in observing certain natural phenomena.

单根三角带所能传递的功率主要与以下因素有关（）。

A．带速、型号、小轮直径

B．转速、型号、中心距

C．小轮包角、型号、工作情况

D．小轮直径、小轮包角、中心距

划定边界的协议由多种文书组成，其基本文件（母约）是（）

A.边界谈判记录

B.边界走向图

C.划界议定书

D.边界条约

（1—3题共用题干）患者，女性，62岁，反复活动后气促20余年，近10天上呼吸道感染后咳嗽，咳黄痰，呼吸困难。体检：严重的脊椎后凸，双肺可闻干性和湿性啰音，心率110次／分，节律整齐，肝右肋下3指。X线检查：双肺肺纹理紊乱；心影大小正常，右下肺动脉干横径18mm。心电图检查：窦性心律，P波高尖，右束支传导阻滞。

对此患者的治疗方案，一般不包括

A．控制呼吸道感染

B．利尿剂

C．祛痰剂

D．氧疗

E．纠正电解质紊乱