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

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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

单项选择题

Mr. Lyall ______ to the waiter at Merci Beaucoup that his steak had been overcooked.

(A) congratulated
(B) complained
(C) resisted
(D) demanded

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