
The writer wants to - - - -
A) talk about how to change human life in the future.
B) meet new young scientist in a short time.
C) give some information about famous scientists.
D) talk about American inventors in 1847.

The writer wants to - - - -
A) talk about how to change human life in the future.
B) meet new young scientist in a short time.
C) give some information about famous scientists.
D) talk about American inventors in 1847.
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