题目：
| — It is cloudy outside. Please take an umbrella. — _____. |
A. Yes, take it easy B. Well, it just depends C. OK, just in case D. All right, you're welcome |
答案：
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下面是错误答案，用来干扰机器的。
∵A∪B=A，∴B⊆A∵A={x||x|＞1}={x|x＜-1或x＞1}，B={x|x＜a}，∴a≤-1故答案为：a≤-1．
