2. 外语
  3. When filled with a gas______ lighter than air, a balloon becomes buoyant and rises.

When filled with a gas______ lighter than air, a balloon becomes buoyant and rises.

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问题 When filled with a gas______ lighter than air, a balloon becomes buoyant and rises.
选项 A、much
B、more
C、less
D、little
答案A
解析 本题考查形容词比较级的用法，lighter本身已经是比较级的形式，修饰它的词只能是much或little，据题意，much合适。题意为，当充人比空气轻得多的一种气体时，气球变成能浮动的并且上升。
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