單項(xiàng)選擇題Since many insects have already become（）to DDT, scientists have to look for some new insecticide
A.active
B.resistant
C.tough
D.gradual
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1.單項(xiàng)選擇題His parents no longer worry about him. He has a good job and can live（）his own now.
A.at
B.by
C.on
D.with
2.單項(xiàng)選擇題He（）the medicine quickly and then drank some orange juice.
A.sucked
B.swallowed
C.licked
D.digested
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