考研英语每周4题

Today there are many charitable organizations which specialize in helping the weary traveler. Yet, the old tradition of hospitality to strangers is still very strong in the US, especially in the smaller cities and towns away from the busy tourist trails.

Question：The tradition of hospitality to strangers ________.
[A] tends to be superficial and artificial
[B] is generally well kept up in the United States
[C]is always understood properly
[D] has something to do with the busy tourist trails

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