单项选择题

Science is still ______ of the causes of many kinds of cancer.

A．ignorant
B．unconscious
C．conscious
D．informed
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Michael: Hi, mom. I'd like you to meet my girlfriend, Susan Lee. Susan, this is my mother. Susan: How do you do, Mrs. Miller. Mother: How do you do, Susan. I'm glad you can join us. ______.
A．Take it easy
B．Please feel natural
C．Make yourself at home
D．Feel all right here
单项选择题
Roger: Hi, Frank. Frank: Hi, Roger. The party is really nice, isn't it Roger: ______. Lots of food and drinks!
A．It is real
B．It sure is
C．It is certain
D．It must be
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