题目内容
（请给出正确答案）
[主观题]
From the last two paragraphs we can conclude that ______.A．exchange students are welcome i
From the last two paragraphs we can conclude that ______.
A．exchange students are welcome in America
B．exchange students must pay much money to the host families
C．American students don't want to join the exchange programs
D．old Americans can benefit from hosting exchange students
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