电子点火系常用的由（）三种。
A.无触点电子点火系
B.无机械提前电子点火系
C.无分电器电子点火系
D.常规电子点火系
参考答案：A, B, C
单词拼写。
1. The experiment _____ (证实) his theory.
2. There's a telephone _____ (在附近), just down the stairs.
3. He succeeded in business and was very w_____.
4. He went d_____ to do some shopping yesterday.
5. On a m_____ morning, it's a little difficult for us to see the road clearly.
动画角色设计主要包含（）等几个方面。
A.形体结构
B.动作状态
C.面部表情
D.服装道具
