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采用什么办法区别n→π跃迁和π→π？

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Dear Sirs,Thank you for your letter of August 20, i(1)us that you are in the m(2) for Chinese toys.To give you a general idea of the goods we are dealing i(3), we are sending you by air a complete set of our s(4) books together with full details of our export prices and t(5) terms, which we hope will reach you in due course.Our goods are enjoying fast sales in many countries for their fine q(6) and reasonable p(7) in spite of the rise in the cost of raw materials. We are glad to say that all the goods listed in our sample books can be supplied f(8) stock and according to your specifications.Should any of the i(9) be interesting to you, please don‟t fai l to send us your s(10) enquiry, upon receipt of which, we will make an offer by cable.Yours faithfully,

I. Listening ActivitiesA Listen to a short dialogue between a man and a woman, and then decide whetherthe following statements are true (T) or false (F).1.Beijing roast duck is their house special.

A. 对
B. 错

2.Many customers like to have chicken.

A. 对
B. 错

3.The man orders a sweet and sour fish.

A. 对
B. 错