2. 外语
  3. The second line of defense in keeping plant diversity seems to be______ From the passage we learn that the world’s botanical ga

The second line of defense in keeping plant diversity seems to be______ From the passage we learn that the world’s botanical ga

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问题 The second line of defense in keeping plant diversity seems to be______
From the passage we learn that the world’s botanical gardens are a very good way to keep plant diversity, but______
选项 A、there are not enough of them.
B、they are mainly run by governments.
C、they do not have enough money to run efficiently.
D、the plants in them are not disease resistant.
答案C
解析
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