单项选择题

The purpose of a （） is to cut down imports in order to protect domestic industry and workers from foreign competition.

A. tax
B. toll
C. fee
D. tariff

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单项选择题
Modern manufacturing has （） a global river of materials into a stunning array of new products.

A. translated
B. transformed
C. transferred
D. transported
单项选择题
It is estimated that, currently, about 50000 species become （） every year.

A. extinct
B. instinct
C. distinct
D. intense
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