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、stern
C、obstinate
D、harsh

答案C

解析 形容词词义辨析题。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”;stem表示“严厉的,苛刻的”;harsh表示“刺耳的,严厉的”。
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