比较某地区解放以来三种病的发病率在各个年度的发展速度，应该绘制（）
A.直方图
B.圆图
C.普通线图
D.半对数线图
E.百分条图
参考答案：D
moon is big and white.[ ]
A. The
B. A
C. An
Think and fill in the blanks. 用所给词的正确形式填空。
1. Danny is too weak to (throw) the ball.
2. We were (walk) to the bus stop.
3. It rains (heavy).
4. I (teach) him to play soccer last night.
5. Last Christmas we (talk) to Santa at the store.
