单项填空(45分)
()1. -Excuse me, whats this for?
-Its a cleaner and it ________ pick up dirt. (2010广州)
A. usesB. is used to C. is usingD. used
答案：B。[解析： it指代前文的cleaner，作主语，可判断为被动语态。is used to被用来。故选B。]
()2. Put the milk in the fridge, ________ it will go bad easily. (2010东营)
A. orB. soC. butD. and
答案：A 。[解析：句意把牛奶放在冰箱里，否则它会容易变质。故选A。]