题目

I ___ the blackboard but ___ nothing on it. A. looked at; saw     B. have looked; saw C. saw; looked at     D. was looking at; was seeing 答案：A5、小强看远处的某点时，其光路如图所示，则下列说法正确的是（　　）A、小强的眼睛是近视眼，应配凸透镜做成的眼镜B、小强的眼睛是近视眼，应配凹透镜做成的眼镜C、小强的眼睛是远视眼，应配凸透镜做成的眼镜D、小强的眼睛正常，无须配戴眼镜