题目

某同学为了了解显微镜下成的像是否是倒像，将写有“d”的不透明纸片放在载玻片上制成玻片标本进行观察，他将会看到的是 A.b                 B.p                 C.q                 D.一片黑暗 答案：D Mrs. Wang has been alone     her husband died 5 years ago. A. since         B. from            C. after           D. for