填空题

【参考答案】

he is lending→he
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单项选择题
The author mentions all of the following inventions as examples of dramatic technological innovations EXCEPT the
A.sewing machine
B.vacuum cleaner
C.typewriter
D.telephone
单项选择题
Humans can distinguish about ______.
A.10,000 different odors
B.10 different odors
C.1,000 different odors
D.100 different odors
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