题目

-----After that, what happened to John? -----The chance to enter _____ came and he took it. A. to collegeB. the college    C. for collegeD. college   答案：Benter the college = go to college意为“上大学”。下列有关显微镜操作的说法，正确的是（ ）A．若高倍镜下细胞质流向是逆时针的，则细胞中细胞质的流向应是顺时针的B．为观察低倍镜视野中位于左下方的细胞，应将装片向右上方移动，再换用高倍镜C．用显微镜的凹面反光镜反光，观察到的细胞数目更多，但细胞更小D．在观察叶绿体和线粒体实验中，先用低倍镜观察，再换用高倍镜观察