单项选择题

A．Whether second hand smoking is liked with cancer.
B．Whether active smoking is linked with cancer.
C．Whether passive smoking by children is liked with childhood cancers.
D．Whether an average degree of passive smoking is harmful.
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单项选择题
A．He accepts the woman’s invitation.B．He doesn’t want to accept the woman’s invitation.C．He has to ask for Susan’s opinion and then he can decide.D．He doesn’t think Susan will agree to go.
A．He accepts the woman’s invitation.
B．He doesn’t want to accept the woman’s invitation.
C．He has to ask for Susan’s opinion and then he can decide.
D．He doesn’t think Susan will agree to go.
单项选择题
A．From rocks in the mountain.B．From the remains of ancient sea life.C．From the soil under the sea.D．From ancient trees.
A．From rocks in the mountain.
B．From the remains of ancient sea life.
C．From the soil under the sea.
D．From ancient trees.
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