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债务人通过购买远期利率合约，固定了未来的债务成本，规定了利率可能上升带来的风险。 ()
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听力原文： (32)Why do we cry？ Can you imagine life without tears？
Not only do tears keep your eyes lubricated, they also contain a substance that kills certain bacteria so they can't infect your eyes. Give up your tears, and you'll lose this on-the-spot defense.
Nor would you want to give up the flood of extra tears you produce when you get something physical or chemical in your eyes. Tears are very good at washing this irritating Stuff out.
Another thing you couldn't do without your tears is cry—from joy, anger, or sadness.
(35)Humans are the only animals that produce tears in response to emotions. And most people say a go0d cry makes them feel better.
(33)Many scientists, therefore, believe that crying somehow helps us cope with emotional situations. Tear researcher, William Frey, is trying to figure out how it happens.
One possibility, he says, is that tears discharge certain chemicals from your body, which build up during stress. "When people talk about 'crying it out', I think that might actually be what they are doing," he says.
If Frey is right, what do you think will happen to people who restrain their tears？ (34)Boys, for example, cry only about a quarter as often as girls once they reach their teenage years. And we all cry a lot less now than we did as babies.
Could it possibly be that we face less stress？ Maybe we've found other ways to deal with it. Or maybe we just feel embarrassed.
(33)
服务贸易的主要规则有（)。A．无条件的最惠国待遇B．国民待遇C．在市场准入方面，规定每一成员方给予服务贸易的主要规则有()。
Mary: What are you working on？Susan: I'm doing some embroidery.Mary: ______.Susan: I don't
建筑材料采购合同的标的包括()。
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