《2025年全效学习同步学练测九年级英语全一册外研版合肥专版》

Ⅰ. 短文阅读(每小题 2 分,满分 8 分)
Many objects in the universe are invisible(看不见的)，but they send radio waves. The radio telescope thus appeared，and it is considered one of the greatest inventions in the twentieth century.
A radio telescope is usually made up of：
One or more antennas(天线) to collect the radio waves. Most antennas are made in the shape of a dish to collect and reflect(反射) the radio waves to the sub-reflector，in the same way as a curved mirror focuses visible light to one point.
A receiver and amplifier(放大器) to receive the radio waves from the sub-reflector，and make these weak radio waves strong enough to be recorded and turned into electronic signal(信号). To make an amplifier sensitive enough，it is usually cooled to very low temperatures (e. g. as low as $-270^{\circ}C$).
A recorder to keep a record of the electronic signals. Most radio telescopes today keep the signals to the computer's memory disk for astronomers(天文学家) to analyse(分析) later.
Radio wavelengths are much longer than those of visible light，and the radio waves from deep space are always weak. To catch these waves，radio telescopes usually have huge antennas. The sizes of most antennas in use today are around 50 to 300 metres in diametre(直径). The antenna of FAST in Guizhou，China，the latest and largest radio telescope in the world，is 500 metres in diametre，as large as the size of 30 football fields.
To avoid interferences，and keep the telescopes sensitive，radio telescopes are built in places where there are no human radio waves or electronic signals. For example，FAST is 5 kilometres away from the closest village and 25 kilometres away from the nearest town.
Radio telescopes create pictures of the sky，not in visible light，but in radio waves. This is extremely useful，because there are objects that can't be seen，objects that we wouldn't even know were there without telescopes.
(C)1. What do radio telescopes help collect from the universe?
A. Light.
B. Objects.
C. Radio waves.
D. Visible signals.
(D)2. Why are most antennas of radio telescopes made in the shape of a dish?
A. To make the antennas strong enough.
B. To increase the number of radio waves.
C. To turn radio waves into electronic signals.
D. To focus radio waves on the sub-reflector.
(D)3. What does the underlined word “interferences” in the passage refer to?
A. The noises made by villagers and animals.
B. The sounds from the radios and televisions.
C. The people who go to Guizhou to watch FAST work.
D. The radio waves and electronic signals from humans.
(C)4. What have we done with the help of radio telescopes?
A. We have received pictures of deep space.
B. We have discovered unknown lives in the universe.
C. We have found some unknown objects in the universe.
D. We have turned the radio waves from space into light.

答案： 1.C 2.D 3.D 4.C

Ⅱ. 任务型阅读(每小题 2 分,满分 6 分)
At the age of four，Allman fell off a train and his eyes were badly hurt. Since then，he has been unable to see anything. It would be wonderful to see again，but bad luck may not be always bad.
In fact，although Allman became blind(失明)，he learnt to love his life more. But he had a hard time before he was successful.
The hardest lesson was to believe in himself and it had to start with the simplest things.
One day a girl gave Allman a baseball. He thought she was laughing at him and he was hurt. “I can't use this，” he said. “Take it with you and roll it around，” the girl smiled and said. Her words got into his head. “Roll it around!” By rolling the ball，Allman could hear where it went. This gave him an idea to do something he never thought of：playing baseball. Years after that，he invented a successful game of baseball for the blind. They called it ground ball.
From then on，Allman began to smile at life and achieved more dreams.
1. Did Allman become blind after falling off the train?（不超过 10 个词）
________
2. What was the hardest lesson for Allman after he became blind?（不超过 10 个词）
________
3. What did they call the game of baseball for the blind?（不超过 10 个词）
________

答案： 1.Yes (, he did).
2.The hardest lesson was to believe in himself. /To believe in himself.
3.They called it ground ball. /Ground ball.