題目列表(包括答案和解析)
A recent survey of 2000 parents in Britain showed that they are often afraid of science questions asked by their curious children only because they have no idea what the answer is. Here is a list of some simple questions that you can ask your parents to see if they know the answers.
Q: Why is the sky blue?
A: You probably know white sunlight is made up of seven colors. While it moves in a straight line when going through space, it starts to divide as it hits “raised area” in the atmosphere. The ones with longest wavelengths pass through easily. The blue , however , can be taken in by the gas molecules (分子) because it has a shorter wavelength , which in turn scatters (使分散) it in different directions. That’s why when you look up at the sky, it appears to be blue.
Q:Why does the moon sometimes appear during the daytime?
A: The simple answer to that is because just like any other object it is being lit by the sun. As long as it is around 45 degrees or even 90 degrees off the sun, it will receive light and be able to be seen. The only time it is not able to be seen during its 28-day orbit (軌道) around the earth is when it is right between the earth and the sun. That’s because its back , which is not lit by the sun, is facing us.
Q: Where do birds/ honeybees go in winter?
A: While the bird part is quite easy, since a lot of them get together and travel, the honeybee part is likely to puzzle your parents. It turns out that these busy insects stop being that active when the temperature drops below 50°F. Instead ,they get together in the lower central area of the hive (蜂巢)and form a ball around their queen. This helps keep both warm enough to survive the cold winter months.
【小題1】The sky looks blue mainly because the color blue in the sunlight_______.
A.has the longest wavelength among all the colors |
B.cannot be taken in by the gas molecules |
C.doesn’t hit “raised area” in the atmosphere |
D.cannot pass through space successfully |
A.2 | B.28 | C.30 | D.31 |
A.They choose to be active in the wild. |
B.They choose to keep themselves warm. |
C.They choose to travel to a warm place. |
D.They choose to get together in the upper central area of the hive. |
A.Why is the sky blue? |
B.Why is the moon able to be seen during the daytime? |
C.Why do birds travel in winter? |
D.Where do honeybees go in winter? |
A.has the longest wavelength among all the colors |
B.cannot be taken in by the gas molecules |
C.doesn’t hit “raised area” in the atmosphere |
D.cannot pass through space successfully |
A.2 | B.28 | C.30 | D.31 |
A.They choose to be active in the wild. |
B.They choose to keep themselves warm. |
C.They choose to travel to a warm place. |
D.They choose to get together in the upper central area of the hive. |
A.Why is the sky blue? |
B.Why is the moon able to be seen during the daytime? |
C.Why do birds travel in winter? |
D.Where do honeybees go in winter? |
閱讀理解。 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
David's got a text message from his friend Sam. Can you understand it? 7,15 20,15 20,8,5 16,1,18,11 This message was in code (密碼, 代碼). How many letters are there in the English alphabet? Twenty-six. So can you read it now?
B instead of C, and so on. His message to Sam shown on the right was very short. Can you understand?
she felt puzzled. She couldn't read it at all. But David was very happy that his sister couldn't read his message! Lots of people use codes to send secret messages. In a war, secrets are very important so soldiers often send each other messages in code. Nowadays, we can use computers to make and break difficult codes. Even before computers, people invented other machines to do this. Here's a famous machine that Germans used in the Second World War (1941-1945). It's called the Enigma Machine. The machines were very big, heavy and expensive. Every day they changed the codes automatically, and this made it almost impossible for anyone to break the codes. The person sending a message had one machine, and the person receiving the message had another. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1.Sam asked David to go to the ______. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
A.park B.house C.museum D.zoo | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
2.Sam told David to meet him ______. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
A.before breakfast B.a(chǎn)fter school C.a(chǎn)fter dinner D.before school | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3.Codes are used to keep something ______. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
A.new B.old C.secret D.known | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
4.People will never know the meaning if they can't ______ the code. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
A.break B.make C.change D.write | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
5.The best title of this passage is . | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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A.English Letters B.Codes C.Messages D.Machines |
根據(jù)句子意思和所給首字母寫出單詞。
1.H____ is your mother?
2.My telephone n________ is 295-8146
3.She is a teacher. H_____ name is Lucy.
4.Answer this q ______, please
5.Can you spell y______ name?
6.The g______ is Ann’s sister.
7.It’s an o______, I want (想要) to eat it
8.My aunt’s son is my c
9.Six and three is n_______
10.Spell “six”, p_______ .
根據(jù)句意及首字母提示完成下列句子(每空一詞)(10分)
1.What is your l name? Green
2.What’s your t number? It’s 555-0192
3.This is my ID c .
4.My pencil-case is w .
5.This is my c game.
6.Answer this q .
7.Spell it, p .
8.Alice is 12 years old. S is a girl.
9.What c is your pen? It’s black.
10.How are you? Fine, t .
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