一个焦距为f的凸透镜，当物体从2.5f移动到1.5f处时，像的大小变化是（ ）

中队在何时必须点名（）。

单句改错

小题1:He is as clever boy as his brother.

小题2:I consider this impossible to finish this task on time.

小题3:He like swimming in particularly in summer

小题4:I could hardly find suitable words expressing myself.

小题5:You should suit yourself to the new environment.

小题6:We were out of breathe when we reached the top of hill.

小题7:You should keep your words after you promise to help.

小题8:I’d like to go to the party last night but I had to finish a report.

小题9:I hate being made fun.

小题10:John would rather stay at home than going out.

关于建筑面积、使用面积、辅助面积、结构面积、有效面积的相互关系，正确的表达式是( )。

A．有效面积=建筑面积-结构面积

B．使用面积=有效面积+结构面积

C．建筑面积=使用面积+辅助面积

D．辅助面积=使用面积-结构面积

采用富氧再生技术后，再生催化剂定碳（）。

A、下降

B、上升

C、不变

D、无法确定

孤岛文学的主要成就表现在（）和（）上。