Don’t touch the book, Sally. You _____ more than one time. A. warned B. are warned C. have warned D. have been warned
现有一瓶葡萄糖溶液，内有适量酵母菌，经测定瓶中放出的二氧化碳体积与吸收氧气体积之比为5：3，是因为
下列句子中，没有语病的一项是 A．通过国家八大职能部门联合开展的专项整治，使房地产领域违法违规、权钱交易行为得到有效遏制，市场秩序有明显
.若数列{an}满足an+1+(-1)nan=2n-1,则{an}的前40项和为 .
16．在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密，不得抄袭材料。每处不超过20个字。 根据气象学上的定义
All morning as she waited for he medical report from the doctor, her nervousness _____. A. has grown B. is growing C. grew D. had grown
已知f(2x+1)=3x-2,且f(a)=4,则a=_______________.
