单选题：The word "sustainable" in the last paragraph is closest in m

题目内容：

The word "sustainable" in the last paragraph is closest in meaning to __________. A．continuable
B．affordable
C．available
D．persistent

参考答案：

答案解析：

The original experiment cannot be exactly duplicated.

The original experiment cannot be exactly duplicated.A．invented B．reproduced C．d

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