如果a和b是互质数，那么a和b没有公约数．

目前撒哈拉以南非洲还比较落后，如果让你帮助非洲摆脱贫困，那么不应该做的是（    ）

名著阅读
A相了相，走到树前，把直裰脱了，用右手向下，把身倒缴着；却把左手扳住上截，把腰只一趁，将那株绿杨树带根拔起．众泼皮见了，一齐拜倒在地，只叫：“师父非是凡人，正是真罗汉！身体无千万斤气力，如何拔得起！”

介词填空

（1）Look! The little boy is getting ____ the bus.

（2）It is dark. The child runs home ____ a hurry.

（3）There are a lot ____ sheep on the hill.

（4）Welcome ____ our class, Tom!

（5）Are you looking ____ your eraser?

（6） ____ the moment, the students are having lunch in the dining hall.

（7）There are hundreds ____ pigs and ducks on his farm.

（8）Many people are waiting ____ the train.

（9）Don’t talk ____ me! I am doing my homework.

（10）Every day each panda can eat fifteen kilos ____ bamboo(竹子).