问题
选择题
Things made of plastic are usually_____, but they are _____ to get polluted.[ ]
A. cheap; easy
B. cheap; easier
C. cheaper; easy
D. cheaper; easier
答案
答案：D
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Things made of plastic are usually_____, but they are _____ to get polluted.[ ]
A. cheap; easy
B. cheap; easier
C. cheaper; easy
D. cheaper; easier
答案：D