·（1）| $\overrightarrow{O{A}_1}$ |=| $\overrightarrow{O{A}_2}$ |=| $\overrightarrow{O{A}_3}$ |=…=| $\overrightarrow{O{A}_n}$ |

·（2）| $\overrightarrow{O{A}_i}$ |的最小值一定是| $\overrightarrow{OB}$ |

·（3）点A和点A_i一定共线    

·（4）向量 $\overrightarrow{OA}$ 及 $\overrightarrow{O{A}_i}$ 在向量 $\overrightarrow{OB}$ 方向上的投影必定相等

其中正确的个数是（   ）

（2016•玉林）图是地球上某节气的昼和夜示意图，在图示节气中，我们家乡的昼夜长短状况是（  ）

根据短文内容完成下列任务。
   It's October 16th. It's Jeff's fifteenth birthday. In the morning Jeff gets up very early. He goes to Tokyo with his parents. They are going to stay there for a week. Tokyo is the capital of Japan. It's very nice. They can see many parks in Tokyo. Jeff likes Tokyo very much.
   They live in Green hotel. It's very big and clean. Oh, in the hotel Jeff meets Iris old friend Lisa. The two kids are very (A)        . In the evening Jeff's father has a birthday party for Jeff in the hotel.  (B) Lisa and her parents also come to Jeff's birthday party. They have a good time. At the party Lisa sings a Japanese song for Jeff, at about twelve o clock, Jeff doesn’t go to bed. He still plays games with Lisa.
When is Jeff's birthday?
____
How does Jeff get to Tokyo?
____
____ 选择意思相近或相同的选项替换划线邵分。
They can see many parks in Tokyo.

____ 选择适当的词汇完成(A)空格部分，使句意完整。
A. interesting  B. healthy         C. happy         D. unhappy
将划线部分(B)翻译为汉语。
____