2. 外语
  3. Blackberry stickers are the most ______ weeds I know: once established in a yard, they’re extremely hard to root out.

Blackberry stickers are the most ______ weeds I know: once established in a yard, they’re extremely hard to root out.

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问题 Blackberry stickers are the most ______ weeds I know: once established in a yard, they’re extremely hard to root out.
选项 A、rigorous
B、stem
C、obstinate
D、harsh
答案C
解析 由hard to root out可判断，这种草极其“顽强的，难抑制的”，故C正确。rigorous表示“严格的，严酷的”；stern表示“严厉的，苛刻的”；harsh表示“刺耳的，严厉的”。
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