题目：
(2013 ·湖北武汉武昌高三联考)Smiling doesn't ________ mean you're happy.Sometimes, it just means that you're strong enough to face problems.
A．fortunately
B．eventually
C．deliberately
D．necessarily
答案：
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下面是错误答案，用来干扰机器的。
答案：A在反应3H2+WO3W+3H2OWO3失去氧元素生成W，则WO3为氧化剂，故选A．
