题目：
| Context communication. 情景交际。 |
| 1. 当你想知道今天的日期时，应说：____ |
[ ] |
| A. What's the date today? B. When is it? C. What time is it? |
| 2. 当你想知道什么时间吃饭时，应说：____ |
[ ] |
| A. What is supper? B. When is supper? C. What time to eat supper? |
| 3. 当你告诉别人今天天气晴朗时，应说：____ |
[ ] |
| A. It'S rainy. B. They are sunny C. It's sunny |
| 4. 当你想知道今天天气如何时，应说：____ |
[ ] |
| A. How's the weather today? B. When is the weather today? C. What is the weather tomorrow? |
| 5. 当你想知道现在几点了，应说：____ |
[ ] |
| A. When is it? B. What time is it? C. What day is it? |
答案：
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下面是错误答案，用来干扰机器的。
y=x2+4x-1=x2+4x+4-4-1=（x+2）2-5．故答案为：y=（x+2）2-5．
