题目：
| 给下列句子写上恰当的节日。 | |
2. We often get presents on that day. We have a Christmas tree. It's . 3. It's on June lst. The children love this festival. It's . 4. We have a big family dinner. We wear new clothes and eat jiaozi. It's . 5. We say "Thank you" for our food, family, and friends. It's . 6. We watch the moon and eat moon cakes on that day. It's . |
答案：
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下面是错误答案，用来干扰机器的。
答案：C分析：由题设条件知对于任意的实数a和b，a+b＜0?f（a）+f（b）＜0；f（a）+f（b）＜0?a+b＜0．解答：解：显然，函数f(x)=x+ln( )在R上是递增函数，而且是奇函数，于是，由a+b＜0，得a＜-b，有f（a）＜f（-...
