问题 填空题

燃烧1m3的煤气约能放出热量3.9×107J,某市煤气管道的煤气收费标准为0.87元/m3,有一户人家在一月内烧煤气消耗了1.17×l09J热量,这个月应该交煤气费多少元?

答案

由题知,煤气热值q=3.9×107J/m3,放出热量Q=1.17×109J,

一个月消耗煤气:

V=

Q
q
=
1.17×109J
3.9×107J/m3
=30m3

一个月收煤气费:

30m3×0.87元/m3=26.1元.

答:这个月应该交煤气费26.1元.

阅读理解

Reading comprehension.

     Do you often feel a little sleepy after lunch? Well, that's normal. Your body naturally lays down. What

should you do about it? Don't drink coffee, take a nap (打盹), instead. There are many advantages of a

daily nap. First of all, you can remember things better and make fewer mistakes. Also, you can learn things

more easily after taking a nap. A 20-minute nap can reduce (减少) your pressure (压力). Finally, a nap can

make you cheerful.

     But there are some simple rules that you should follow about taking a nap. You should take up at noon,

about eight hours after you wake up. In general, a 20-minute nap is the best. If you sleep longer, you may

fall into a deep sleep. After waking up, you'll feel worse. Also, you should set an alarm clock. That way,

you can feel fully relaxed during the nap. You don't have to go looking at the clock so that you don't oversleep

(睡过头).

     Now, the next time you feel sleepy after lunch, don't get stressed. Put your head down, close your eyes

and have a short sleep during the daytime.

Fill in the blanks according to the passage. Only one word for each blank.

     When you feel a little sleepy after lunch, you should take a nap (1)______ of drinking coffee. After twenty

(2)______ nap, you can remember things better, make fewer mistakes, learn things more easily. It can reduce

your pressure and cheer you up. But you don't (3)______ the simple rules, you won't feel (4)______. In order

to (5)______ yourself during the nap, you should set an alarm clock to wake you up on time.

填空题