学进去-教育应平等而普惠
试题
类型:完型填空
难度系数:0.65
所属科目:初中英语
(In an English class)
Mr Wu: Boys and girls, yesterday I asked you to collect some information about China’s Tianwen 1 probe. Let’s see what you’ve _______.
Li Ping: I downloaded something. May I use the PPT, Mr Wu?
Mr Wu: Sure. _______.
Li Ping: Look at this picture. On May 15, China’s Tianwen 1 probe made a historic landing on Mars! Following the US, China is now the _______ country in the world to _______ land a probe on Mars. It will give Chinese _______ their first chance to study the Red Planet closely.
Gu Yue: _______ was Tianwen 1 probe sent?
Li Ping: In July 2020. The probe entered Mars orbit(轨道)in February 2021. Experts said the _______ of sending the probe into orbit was equal to hitting a small ball from Paris and landing it in a hole in Tokyo. And the final _______ was even more difficult.
He Mei: I hear it’s _______ called the “nine minutes of terror”.
Li Ping: Yes. In nine minutes, the probe had to reduce its ________ from 20,000 km per hour to zero, landing from 125 km above Mars. ________ the probe is 320 million km away from Earth, there is a signal delay(延迟)of over 10 minutes if the research team tries to control it from Earth. So the probe had to ________ the landing on its own!
Gu Yue: That’s amazing!
Li Ping: Indeed. When the probe finally slowed down at 100 meters above Mars. It stayed in the air and ________ the landing area. It had to move away from the objects in its way such as rocks, ________ finally touching down.
Mr Wu: Well done, Li Ping! Thank you for showing our ________ Tianwen 1 probe. Let’s see who has something else to share…1.
A.realizedB.foundC.understoodD.met
2.
A.Better notB.Not at allC.Go aheadD.With pleasure
3.
A.firstB.secondC.thirdD.fourth
4.
A.successfullyB.carefullyC.speciallyD.peacefully
5.
A.inventorsB.fighterC.passengersD.scientists
6.
A.WhenB.WhereC.HowD.Why
7.
A.possibilityB.gravityC.difficultyD.safety
8.
A.kickingB.hittingC.sendingD.landing
9.
A.stillB.insteadC.everD.also
10.
A.speedB.heightC.weightD.length
11.
A.ThoughB.UntilC.UnlessD.As
12.
A.put outB.carry outC.run outD.look out
13.
A.checkedB.coveredC.protectedD.avoided
14.
A.whileB.onceC.beforeD.after
15.
A.luckyB.comfortableC.fantasticD.energetic
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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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