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

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

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问题 A. reactive
B. lightest
C. important
D. complete
E. flammable
F. unnecessary
Among the elements of noble gases Helium is the______.
选项
答案B
解析 句意：惰性气体中的氮气 。根据第三段最后一句话可知，氦气是最轻的。故选B。
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