基础落实
ⅰ.课文理解
1.what’s the main idea of this passage?
a.famous doctors.
b.how penicillin and aspirin were invented.
c.aspirin and penicillin.
d.how to keep healthy.
2.which of the following is considered to be the time when aspirin was invented?
a.3,500 years ago.
b.2,500 years ago.
c.1897.
d.1899.
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