问题
How amazing it is that Zuckberg can speak Chinese! After all, it is a big_____ for any westerner to learn such a totally different language.
A:adventure
B:achievement
C:trend
D:challenge;
B:achievement
C:trend
D:challenge;
正确答案是：
同类题型
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The children in poor areas can’t afford theireducation. We should think ________ to help them.