小冬兰家养了a只黑兔，养的白兔比黑兔只数的4倍还多2只．养了____ 只白兔．

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。
____

已知氧气、氮气和氨气的沸点分别为：﹣183℃、﹣196℃和﹣33.5℃，将三种气体在常温下混合后逐渐降温至﹣150℃，在降温的过程中，它们液化的先后次序是（　　）

现有A～G七种物质，已知A是赤铁矿的主要成分，E的浓溶液稀释时会放出大量的热，G溶液为蓝色，它们之间存在如图所示的转化关系：