Lesson 20 Snake poison蛇毒
First listen and then answer the following question.
听录音,然后回答以下问题。
What are the two different ways in which snake poison acts?
How it came about that snakes manufa...
Lesson 23 One man's meat is another man's poison各有所爱
Listen to the tape then answer the question below.
听录音,然后回答以下问题。
What was it about snails that made the writer collect them for his friend...