I ____ a poem last night. [ ]
A. wrote
B. writes
C. writing
答案:A
If you can come to visit us, will make my parents happy. [ ]
A. that
B. which
C. what
D. all
(1)图描述的是 眼的成像情况,请在方框内画出可以矫正视力的透镜。
(2)请在图中用笔画线代替导线将灯泡和开关正确接入电路。
(3)请在图中画出小女孩对跷跷板的压力F的示意图。