9AUnit1 Test一、单项选择(每题2分,计40分)( )1.----Which do you prefer, tea _______ coffee? ----Tea, please. A. but B.so C. or D. and( )2.----Would you like to come to my party on Saturday, Sam? -----I'd love to, ________ I can't. I have to take a piano lesson. A. and B. but C. or D. so( )3.Let's go to Kunming for vacation. It's_______ too hot ______ too cold..