It's a chicken-and-egg question. I can't answer you now.           
#45634
A
easy
B
clear
C
difficult
D
funny
推荐题目
 Fruit and vegetables are _________food.
#45716
A
health
B
unhealthy
C
healthy
D
healthily
The old man lives ____ but he doesn’t feel ____. 
#47406
A
lonely; alone
B
alone; alone
C
alone; lonely
D
lonely; lonely
There is ______ food in the fridge.
#45620
A
none
B
no
C
not
D
no any