教材编写的直接理论依据是（）
A.语言学、心理学、教育学
B.语言教学理论和学习理论
C.目的语语言学和目的语文化
D.教学计划与教学大纲
参考答案：B
______、各类缓冲站以及______是生产物流系统的三大要素。
用所给单词的适当形式填空
1. They refused to give any interviews to __________(journal).
2. Edison won his spurs as an __________(invent) while rather young.
3. The piece of bamboo makes a __________(music) sound.
4. My parents are worried about the __________(safe) of me all the time.
5. The air was __________(pollution) by factory smoke.
