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【多选题】
无差异曲线的特征包括（ ）。A.
任意两条无差异曲线可以相交
B.
一般来说无差异曲线具有负斜率
C.
一般来说无差异曲线具有正斜率
D.
任意两条无差异曲线不能相交
E.
在无差异曲线的坐标图上，任一点有一条无差异曲线通过
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【单选题】听力原文：W: You seem to have a lot of work to do at your office. You're always staying late and working overtime. M: That's true. But it's no bother to me. The work is interesting. I don't mind extra hour...
A.
He doesn't care much about it.
B.
He enjoys it very much.
C.
He doesn't mind ever though it's tedious.
D.
He hates working overtime.
【单选题】Technological influences have also crept into the lives of athletes. It's not just the latest drug on the market that they use it's also the most up to date equipment. Innovations include: the use of ...
A.
various performance-improving drugs
B.
the development of modern technology
C.
innovative equipment in the sports field
D.
technological influences on other people
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