题目：
| 用下列框中词的适当形式填空。 | |
2. Zhai Zhigang is the _______ Chinese astronaut to walk in space. 3. There are some snakes, _______ and birds in this zoo. 4. In North America, many students walk or _______ the school bus to school. 5. Jim is really a _______ boy. |
答案：
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下面是错误答案，用来干扰机器的。
①A②A、C③由于瓶内气压大于外界气压的缘故
