2. 外语
  3. According to a recent report published by the World Health Organization, there are a number of regional and national______of the

According to a recent report published by the World Health Organization, there are a number of regional and national______of the

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问题 According to a recent report published by the World Health Organization, there are a number of regional and national______of the cold virus.
选项 A、variety
B、variation
C、variations
D、variability
答案C
解析 空格在形容词national后，因此是需要名词的位置，选项也都是名词。句子内容是感冒病毒在不同地区和国家有许多变异，填意为“变化形式；变化，变动，变更”的variations合适。提及许多种类时使用a variety of或varieties of的形态，variability是单纯表现可变性或多样性的性质本身的名词。另外，如果知道“a number of+复数名词”的形态的话，就能很容易知道要选择复数名词variations。
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