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2011·桂林十八校第一次月考）At the end of the cross-talk, __ audience present in the hall burst into ___ laughter.

   A. an ; the          B. the ; a          C. an ; /           D. the; /

（2011·桂林十八校第一次月考）23. This stranger is familiar _________this area.

A. to          B. for         C. with         D. in

（2011·桂林十八校第一次月考）28. Obama’s success in presidential election proves that the color of one's skin shouldn't be a ______ to success.

A. barrier                     B. behavior                 C. battle                      D. bunch

（2011·桂林十八校第一次月考） A troop _____fine weapons are marching towards the front.

A .are equipped with　　 B. to be equipped with　 C. equipped with　　 D. being equipped with