新概念英语第四册多项选择题：Aman-madedisease
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新概念英语第四册多项选择题：A man-made disease
Multiple choice questions多项选择题
Choose the correct answers to the following questions.
Comprehension理解
1，One of the reasons rabbits multiplied so rapidly in Australia is that they ______.
a.were unwisely introduced by enterprising settlers
b.breed rapidly
c.overran the continent
d.overcame their natural enemies in the Antipodes
2，Scientists found ______ of  ...