難度：★    考點(diǎn)：介詞的使用

　　1.-Thanks ______ joining the Talk Show!

　　-You're welcome.

　　A. by             B. on             C. of  D. for

　　2.Sam likes trekking_______the jungle, because he thinks it's exciting.

　　A.over   B.under   C.across    D.through

　　3. The 30th Olympic Games will be held in London ______ about six weeks this year.

　　A. at   B. on    C. after   D. in

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