学进去-教育应平等而普惠
试题
类型:阅读选择
难度系数:0.40
所属科目:小学英语

There are some interesting old ways to send messages. Some people use smoke to show they need help. Their friends can see the smoke, and they know there is a problem. Then they will go to help. Other people use birds to send messages. They take a bird from its home. They write a small message on some paper and put the paper on the bird’s leg. Then the bird will fly back home with the message. Of course, there are many new ways to send messages today. Many people use the Internet to send messages. The messages travel around the world very quickly. People also send text messages on their phones (电话). It's very fast, too.

1.Some people use ______ to show they need help. It’s one of the old ways to send messages. (       )
A.smokeB.friendsC.water
2.People take a bird ______ to send message. (       )
A.from a friendB.from its homeC.from a shop
3.People write ______ on some paper and put the paper on the bird’s leg. (       )
A.a small messageB.a letterC.their names
4.When people see the smoke, they will ______. (       )
A.go to help their friendsB.take a birdC.be happy
5.Many people use ______ to send messages today. (       )
A.birdsB.smokeC.the Internet and phones
6.The new ways to send messages are ______. (       )
A.very fastB.not goodC.bad
7.In this passage, the word “messages” means ______. (       )
A.命令B.情况C.消息
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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19

y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19
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