单项选择题

Questions 11 ～ 14 are based on the following passage. What is the substance in cigarettes that causes cancer

A．Nicotine.
B．Not mentioned here.
C．Tar.
D．Cigarette ashes.
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单项选择题
How many animal diseases are mentioned in the interview
A．Two.
B．Three.
C．Four.
D．Five.
单项选择题
A．linkedB．linkingC．linksD．link
A．linked
B．linking
C．links
D．link
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