单选题Since man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.AAsBWhetherCWhileDNow that
单选题
Since man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.
A
As
B
Whether
C
While
D
Now that
参考解析
解析：
句意：尽管人类现在能创造出放射性元素,却无法降低它们的辐射。while在本句中引导让步状语从句，意为“尽管，虽然”，连接两个对比意味强烈的句子。as引导让步状语从句时，从句须倒装。whether引导让步状语从句时，常与or连用，意为“不管…还是…”。now that引导条件状语从句，从句内容是既成的事实，意为“既然…”。
句意：尽管人类现在能创造出放射性元素,却无法降低它们的辐射。while在本句中引导让步状语从句，意为“尽管，虽然”，连接两个对比意味强烈的句子。as引导让步状语从句时，从句须倒装。whether引导让步状语从句时，常与or连用，意为“不管…还是…”。now that引导条件状语从句，从句内容是既成的事实，意为“既然…”。
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