单项选择题

One way or another, management has to do something to increase worker productivity, ______ the company will face ruin.

(A) and
(B) so
(C) but
(D) or
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单项选择题
With the help of the Internet, online shoppers can ______ compare prices, products, and make the best decision possible before shopping.
(A) ease
(B) easily
(C) easy
(D) with ease
单项选择题
The meat packing industry is focused on producing meat for human consumption, but it also yields a ______ of by-products such as hides and feathers.
(A) varies
(B) various
(C) vary
(D) variety
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