简述中学德育的主要途径。
参考答案：
（1）政治课与其他学科教学。（2）课外活动与校外活动。（3）社会实践。（4）团队活动与集会活动。（5）班主任工作等。
—He couldn't have finished his homework last night, _________he?
—No. You see, he is busy doing it now.[ ]
A. has
B. could
C. must
D. did
一种杀虫药剂能否发挥其杀虫作用，取决于哪两个方面？
