一、 单项选择：从各小题所给的 A、B、C、D 四个选项中,选出一种最佳答案。（共 20 小题;每题 1 分，满分 20 分.）1．You can’t pass the exam _________ you study hard.A．if B．because C．unless D．so2．Look out! Don't get too close to the house roof is under repair.A．whose B．which C．of which D．that3．If it were not for the fact that she _________ sing， l would invite her to the party.A．couldn't B．shouldn’t C．can’t D．might not4．Always read the _________ on the bottle carefully and take the right amount of medicine。A．explanations B．instructionsC．descriptions D．introductions5．Green products are becoming more and more popular because they are environmentally .A．common B．various C．friendly D．changeable6．-What happened to you this morning？—The teacher asked me for my _____ when I was late again.A．meaning B．idea C．excuse D．answer7．—Would you help me put away these things？-_________。A．Yes， quite right B．Never mindC．You’re welcome D．With pleasure8．—Here’s coffee and tea. You many have ________.—Thanks。A．either B．each C．one D．it9．—Will you please stay here for the party？-Sorry, I ________。 I'll have to go to an important meeting。A．mustn’t B．needn't C．can’t D．won’t10．—What does the lady look like？-_________。A．She's fine and well B．She's really a nice ladyC．She's tall and thin D．She like wearing skirts11．—Are you going to buy a camera？—Yes. But there are so many kinds that I can’t decide ________ to buy.A．what B．which C．how D．where12．-I hear the weather will _________ cold for another week。—I hope not. I hate cold weather。A．turn B．last C．stay D．get13．—Why don't you do it yourself?—Sorry, I don’t think I'm ______ to. I need someone’s help。A．possible B．ready C．afraid...
