If I knew him last year, I would have made good friends with him.
7（）
A. off and on
B. back and forth
C. up and down
D. far and wide
According to the passage, you may （） to find more information about women and heart disease.
A. conduct a survey
B. consult your doctor
C. turn to researchers in person
D. go to a particular website
If an adder senses your approaching, it will probably （）.
A. attack you immediately
B. disappear very quickly
C. wait to frighten you
D. move out of the way
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