单项选择题


Conversation 2

A．Have a rest.
B．Take a walk.
C．Give more information.
D．Wake him up.
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单项选择题
A．Jack didn’t study hard.B．Jack studied very hard.C．Jack passed the exam.D．Jack failed in the exam.
A．Jack didn’t study hard.
B．Jack studied very hard.
C．Jack passed the exam.
D．Jack failed in the exam.
单项选择题
Birds don’t get lost on their migratory flights, and the reasons ______.
A．have been known to scientists for years
B．have only recently been discovered
C．are known by everyone
D．will probably remain a mystery
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