一个有趣的英语阅读理解题~~~高手请帮帮忙啊~~急~~

Denis was a thief. He wrote a letter to another thied Pat.But the police got the letter.It reads:BNLD ZS LHCMHFGS ZMC GZUD SGD SGHQSM ONTMCR VHSG XNT.
What's it about?How can you read it? The policemen were quick. They studied the letter carefully and soon found out what they want. Now let's suppose you were a policemen. Can you read Denis' letter?
Maybe you need some help:When denis wanted a letter,he wrote down the letter before it in the alphabet.
Now can you read Denis' letter? what must Pat do ?When? And what did Denis want?
问题是1 In the letter Denis asked Pat to go at( ) A. noon B.midnight
C. five o'clock D.eight o'clock

问题2 Suppose Pat asked Denis to "meet at the railway station!" What would he write?
A.LDDW XS WHK VDLDZDB VSZSHNM
B.LDDS CV VJG TCKNYCA VCVKQPY
C.LDEU BV VIF QZHKVZX TUVUJPO
D.LDDS ZS SGD QZHKVZX RSZSHNM

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