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引发烟雾的主要污染物是
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首先考虑的疾病为()。
在护理中，告知产妇采取哪种卧位为恰当 ()。
首先考虑的并发症是
听力原文：W: Exercise, exercise, exercise, we hear so much about it these days that even the 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 or 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 compensate for that.
M: How？
W: By adding leg exercise so the arms don’t do all the work. Arm exercises alone aren’t enough to increase metabolism before fatigue sets in. The more of a body that involves in the exercise, the better.
M: And in turn, I' m sure that there is a great chance of losing weight.
W: Sounds right to me.
M: So, what exercises do the experts recommend？
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 wearing arms weights.
M: I must try that. I like to walk a lot.
According to the conversation, what is one problem with arm exercises？
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