单项选择题
I (don't think) a warm winter always (has) a negative influence (on) our life, (hasn't it)（）
A．don't think B．has C．on D．hasn't it
单项选择题 Skating can be good for you （） correctly.
单项选择题 The doctor tried to do an experiment to find out the （） of the medicine on the mice.
单项选择题 With larger numbers of graduates than ever before, just having a degree will no longer be enough to make you （） in the crowd.
