[单项选择]In the English letter of invitation the one who sends out the invitation appears （　） of the letter.
A. at the very beginning
B. at the end
C. at the bottom
D. in the middle

[填空题] Letter One
Jan. 25, 2007
Dear Mr. Guan Li,
From your advertisements we know that you are making transformers (变压器) in a variety of types. We are interested in your products. Would you please send us the details of your products If possible, please send us some pictures of the products.
Looking forward to your early reply.
Yours sincerely,
Louis Smith
Letter Two
Feb. 14, 2007
Dear Mr. Louis Smith,
It’s our pleasure to submit the attached quotation (报价) for your review and consideration. Here enclosed are some pictures of our latest types of transformers. This quotation package consists of the following:
Section 1 Price list for transformers
Section 2 Types of transformers
Section 3 Technical