單項(xiàng)選擇題

She's part of a team of scientists who are（）upon cancer research.

A.worked
B.arranged
C.engaged
D.involved

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單項(xiàng)選擇題

Tourism has（）agriculture as the nation's main industry.

A.recalled
B.reckoned
C.redirected
D.replaced

單項(xiàng)選擇題

I cannot tell the（）difference between the twins.

A.slender
B.slight
C.single
D.simple