1 . “x与y的差”用代数式可以表示为_______

2 . 你学校每学期都有郊游吗？
Do you have a school trip ________ ________?

3 . 碰到许久未见的同学，你可以这样说：
____________________________.

4 . I want to be a ________ (科学家) in the future.

5 . The human brain ________（weigh）about 1.4 kilograms, but it can hold much more information than most computers.

6 . John goes on a short j________ in the boat.

7 . The teacher always tells us the_________(important)of being an honest man．

8 . Liu Yang, an ________（优秀的） astronaut, is the first Chinese woman to go to outer space（太空）.

9 . Yunnan is ________ the southwest of China.

A．on

B．at

C．to

D．in

10 . Hou Yi is the main character of a traditional Chinese story and he s ________   nine suns in the story.