题目

南瓜的扁盘形、圆形、长圆形三种瓜形由两对等位基因控制（A、a和B、b），这两对基因独立遗传。现将2株圆形南瓜植株进行杂交，F1收获的全是扁盘形南瓜；F1自交，F2获得137株扁盘形、89株圆形、15株长圆形南瓜。据此推断，亲代圆形南瓜株的基因型分别是 A．aaBB和Aabb      B．aaBb和Aabb     C．AABB和aabb     D．AAbb和aaBB 用下列短语的适当形式填空。 In the future      grow up      find out      all over the world       no longer be able to     all the time      at a distance of      in order to      be worth it1. Don't worry. They will               tell you the news soon.2. Tom studied late at night                pass the exam. 3. I believe people could travel in space               . 4. Who said we couldn't play with toys when we              ? 5. The math problem is very difficult, so she fails to               the right answer. 6. This planet is               303,297,200 kilometres, and we can't see it with our eyes. 7. Remembering these words is hard, but it              . 8. The carriage (马车) is                used in most cities nowadays. 9. A new film will be on tomorrow morning, and Jack was thinking about it               this afternoon. 10. In 2008, you will see people                gather in Beijing to join the Olympic Games.