book 4 unit 6 unexplained mysteries of the
natural world (intensive
learning aims:
1. to learn about several unexplained mysteries of
the natural world.
2. to master the usage of may/might; (not) likely
learning process:
ⅰ. introduction
as we know, there are some unexplained mysteries in t资源难易程度:★★★★★★★★★★★★★★★
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