题目内容：
The expected life-span of Beijing residents has gone up by __ compared with that a decade earlier.
[A] 1.5 years
[B] 1.4years
[C] 1.2 years
[D] 1.1 years
参考答案：
答案解析：
单选题：The expected life-span of Beijing residents has gone up by _
- 题目分类：专四
- 题目类型：单选题
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The expected life-span of Beijing residents has gone up by __ compared with that a decade earlier.
[A] 1.5 years
[B] 1.4years
[C] 1.2 years
[D] 1.1 years