题目内容
假设某培训班上的学员甲和乙由亍:t3j间关系约好轮流去上课，则把看到甲去上课的事件设为A，把看到乙去上课的事件设为B，于是事件A与事件B互为()。
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某项投资计划，预期有70%的机会获取收益率5%，有30%的可能性亏损5%，则该投资项目的期望收益率为()。
A．Bemuse she had them put in only a few months ago.B．Because she wanted to save the ne
听力原文：M: Do I have enough postage on this package？
W: Let's see. You already have one 15-cent stamp, end two 25-cent stamps on it. You only need one more 15-cent stamp.
Q: What is the total amount of postage required to mail the package？
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听力原文：W: Exercise, exercise, exercise! We hear so much about it these days, yet even experts can't agree on which exercises are best. Now some doctors are strongly encouraging arm exercises.
M: Arm exercises？ Is that because our arms are too fat and flabby？
W: Actually that's not the main reason. They say that arm exercises are an ideal way to become physically fit.
M: But don't arm exercises raise your blood pressure？
W: That they do. But the article I read mentioned ways to overcome that.
M: How？
W: By adding leg exercises, so the arms don't do all the work. The mare of the body that is involved in the exercises, the better.
M: And in mm, I am sure, there's a greater chance of losing weight.
W: Sounds tight to me.
M: So what exercises do the experts mend？
W: They mentioned quite a few. But some of the more popular ones are cycling with special bicycles that make you use both your arms and legs. And walking vigorously while you are moving your arms.
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