单项选择题

Indeed, ______ may develop in behavior occurring between different species.

A．expectation
B．reciprocation
C．specification
D．visualization
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单项选择题
My friends and I ______ one another when we're apart, and we shall continue to care about each other until we are permanently parted by death.
A．pine for
B．yearn for
C．lust for
D．languish for
单项选择题
Some women, particularly those over 35 years of age, seem to be more ______ more serious problems such as clots in veins if they smoke heavily.
A．blamable
B．attributable to
C．vulnerable to
D．responsible for
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