单项选择题

Hunger is caused by （）

A．too much food and water in the body
B．a lack of oxygen in the blood
C．seeing or thinking about food
D．a lack of certain chemicals in the blood

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单项选择题
Register, in this passage, most nearly means（）

A．fire
B．start
C．signal
D．revise
单项选择题
In the second paragraph, the term in effect means（）

A．in fact
B．it is doubtful
C．without reason
D．often
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