Comets(彗星)are parts of our solar system．Like the planets, they go around the sun．
But comets are not made of solid rocks like planets．A comet is a ball of dust, stones, and ice．Many people call comets dirty snowballs．
The “snowball” may be only a few miles across．But when the sun heats the “snowball, ” much of it is changed to gases．The gases spread out and form the comet's head, which may be thousands of miles across．
A comet moves fast in its trip around the sun．But when we see it, the comet does not seem to move．That's because it is so far away．The moon moves fast, but when you look at it, you can't see any motion(运动)．That's because the moon is far away．
Each year astronomers(天文学家)discover new comets．Some of them are seen only once．They make one trip around the sun and then go away out into space．The sun's gravity cannot hold them．
Other comets, like Halley, keep returning．They have been captured by the sun．Halley's earliest visit was probably 3, 000 years ago．It may keep returning for another 3, 000 years．
But every time a comet goes around the sun, the comet loses part of itself．Gases and dust are pulled out of the comet．That's why Halley is now dimmer(暗淡的)than it used to be．Next time it visits us, in 2062, it may be even dimmer．Each visit it may get dimmer and dimmer, until it finally disappears．
(1)
What is this passage mostly about?
[ ]
A．
Comets and the sun．
B．
Why comets are like snowballs．
C．
Who discovered the first comet．
D．
Facts about comets．
(2)
How does the writer help the reader understand what a comet looks like?
[ ]
A．
By telling about a famous one．
B．
By explaining how far away it is．
C．
By describing how fast it moves．
D．
By describing it as a dirty snowball．
(3)
What is the most likely reason the writer wrote this passage?
One day, Allan and his friend Henry went swimming in a river．It was very hot．How happy they were in the river! After they got out of the water, they played games in the sun for a while．
On their way back, Henry saw some flowers．He liked flowers very much and ran into the green field to look at them．Now Allan was walking by himself．
Then he heard Henry calling out, "A snake(蛇)! Help!…"
"What's wrong with you?" asked Allan．
"A snake bit(咬)me in the leg．Come here!"
Allan ran over and saw a small red wound(伤口)on Henry' s leg．
"The snake was in the grass．I didn't see it．"
"Sit down quickly"! Allan told Henry．
Allan put his mouth at the little red wound and began to suck(吸)at it．In this way he saved(挽救)Henry's life．"Oh, Allan, it's very kind of you to help me．"
"That's all right．We are friends and we must always help each other．"
(1)
It was _________ when-Allan and Henry went out．
[ ]
A．
hot
B．
cold
C．
raining
D．
wet
(2)
After swimming, they played in the sun _________．
[ ]
A．
the whole morning
B．
for 2 hours
C．
long
D．
for a while
(3)
On their way home, _________ got something wrong with his _________
[ ]
A．
Allan; leg
B．
Allan; head
C．
Henry; leg
D．
Henry; head
(4)
Henry and Allan are _________．
[ ]
A．
workers
B．
good friends
C．
brothers
D．
farmers
(5)
Which of the following(下面的)is true?
[ ]
A．
Henry went to look at the flowers with Allan．
B．
Allan saved Henry' s life．
C．
Allan saw the snake．
D．
They ran to the hospital at once．
阅读理解。阅读下列短文，然后从所给的选项中选择最佳答案。
It's Charlie's birthday today, but he isn't feeling happy．No one wishes him a happy birthday．Mother says nothing about his birthday．She just tells Charlie to play outside．At lunchtime, his mother calls, “Come in for lunch, Charlie! ” Charlie slowly walks into his house．But the living room looks different．Charlie sees a big “Happy Birthday” banner(横幅)．Then, he sees a birthday cake, balloons, presents, and all of his friends．“Happy birthday! ” everyone shouts．Charlie's face lights up．He is happy and surprised(吃惊)．No one forgets his birthday after all!
(1)
What is this story about?
[ ]
A．
Eating cake．
B．
Celebrating a special day．
C．
Forgetting a birthday．
D．
Having fun at a friend's party
(2)
Why is Charlie not happy in the morning?
[ ]
A．
He doesn't like his party．
B．
He doesn't like his presents．
C．
He wants to eat cake．
D．
He thinks people forgets his birthday．
(3)
Why does the living room look different?
[ ]
A．
There are many decorations(装饰)．
B．
The lights are on．
C．
There is a birthday cake．
D．
There are many presents．
(4)
What does the underlined(划线的)word “light up” properly mean(意思是)here?
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