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盐析法沉淀蛋白质的原理是()。
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When will the letter of credit be opened？
听力原文：Man: Excuse me. I'd like to find out about flights to New York.
Woman: Well, let's see. One just left about five minutes ago; and there's another one at ten.
Man: What time is it, please？
Woman: It's five to eight.
Man: So the plane leaves in about two hours.
Woman: That's right. Have you bought your ticket？
Man: No, I haven't, Can I buy one here？
Woman: I'm afraid you can't. You'd better go to the hooking office.
Question 8: What time is the next flight to New York？
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A．Its shape.B．Its size.C．Its location.D．Its brightness.
听力原文： The United States says it will officially ask France to return an American man wanted for killing a doctor 3 years ago in New York State. French police arrested James Cope Thursday in France. He is charged with killing a doctor who helped women end unwanted pregnancies. The head of America's Federal Bureau of Investigation Louis Free says the United States will work closely with France.
Q: When did French police make the arrest？
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