单选题：Among the elements of noble gases Helium is the___.

题目内容：

Among the elements of noble gases Helium is the___. A．lightest
B．reactive
C．important
D．complete
E．flammable
F．unnecessary

参考答案：

答案解析：

paragraph 5________

paragraph 5________ A．What are noble gases? B．what is the periodic table? C．What

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