单项选择题

The Consumers' Institute website is normally a ______ primary source of information about new products.

(A) rely
(B) relying
(C) reliable
(D) reliably
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单项选择题
______ scientists to develop a vaccine for the bird flu virus, they could potentially help save millions of lives.
(A) If
(B) Should
(C) Were
(D) Unless
单项选择题
The latest figures show that the unemployment rate is at its ______ level since the oil crisis of the 1970s.
(A) high
(B) highly
(C) higher
(D) highest
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