短文填空。

Apples’ Words

I am an apple. You can find me all around the world (世界各地). I am not like my brother----pear. I am rounder (更圆). I am not like my sister----banana, either. She is longer(更长). I am delicious, so people all over the world like to eat me. I am very cheap, I can keep people healthy. There is an old English saying(谚语): An apple a day keeps the doctor away.

小题1:The apple’s brother is _____________.

小题2:Banana is the apple’s _____________.

小题3:Apples are _________, so we like to eat them.

小题4:An apple a day keeps the _________ away.

小题5:I am very cheap _______ I can keep people health.

复合型顶板推垮型冒顶的发生必须具备的条件有（）。

A、断裂

B、离层

C、推力大于阻力

D、推力小于阻力

E、去路和倾角