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单选题
We can conclude from the passage about nuclear fusion EXCEPT ______.
A
it has great potential to produce abundant clean energy
B
NIF has just finished constructing a practical fusion reactor
C
extreme temperatures are needed to work it
D
it has not been successfully used to produce net energy gain in labs
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参考解析
解析：
题目问的是：我们不能从文中得出核聚变的什么信息？根据文章第1段中的“The US has finished constructing a huge physics experiment—NIF”可知，美国结束了NIF的大型物理试验，而不是NIF结束聚变反应堆。故选B。
题目问的是：我们不能从文中得出核聚变的什么信息？根据文章第1段中的“The US has finished constructing a huge physics experiment—NIF”可知，美国结束了NIF的大型物理试验，而不是NIF结束聚变反应堆。故选B。
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