看图填空。

     Jack was woken up    l    the shouting " Fire ! Help! Fire! Help!. . . " What had    2   ?  He   3   out of the window. Wow!

He found that his neighbor's   4   was on fire. Jack jumped off the bed and rushed to the telephone. He made a    5   to the

police.    6   , he ran out and    7     his neighbor (to) fight   8     the fire. Soon the fire-fighters came and in a short time the fire

was put    9  . And the house owner    10   Jack and fire-fighters a lot.

1.           2.           3.          4.           5.           

6.           7.           8.          9.           10.      

在一个稳定的生态系统中，各种生物的数量关系是[ ]

A．植物<草食动物<肉食动物 

B．植物>草食动物>肉食动物

C．植物=草食动物=肉食动物   

D．不一定