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【单选题】
51 系列单片机的复位信号是( )有效。A.
高电平
B.
低电平
C.
脉冲
D.
下降沿
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反馈参考答案：
举一反三
【单选题】(Section B passage 1) 1.
A.
Children know how to handle a real gun.
B.
Children are not interested in real guns.
C.
Children know not to touch a real gun.
D.
Children won't know where a gun is hidden.
【单选题】Section B passage 1
A.
The sky is space.
B.
High in the sky the air is thin.
C.
There is nothing in the sky.
D.
The sky is all around the world.
【单选题】(Section B passage 1) 5.
A.
She fought against gun violence.
B.
She called on the Government to have gun control.
C.
She always put a gun in her car.
D.
She asked people to support gun ownership.
【简答题】( A ) Dear Jack, I am in China now. I have many new friends here. They are very friendly. I often have dinner with them. I like many kinds of Chinese food, like Sichuan food, Hunan food and Guan...
【单选题】(Section B passage 1) 3.
A.
She tried to get her gun.
B.
She crawled on the floor.
C.
She rushed to the madman.
D.
She ran to the door.
【简答题】Section B Passage 1
【单选题】(Section B passage 1) 2.
A.
They are 3-7 years old.
B.
They are 5-9 years old.
C.
They are 8-12 years old.
D.
They are 10-14 years old.
【单选题】(Section B passage 1) 3.
A.
Only a few.
B.
Half of the children.
C.
All of the children.
D.
Most of the children.
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