有个级、万级和亿级的数，最多的是九位数。[ ]
错误
The simple joy of reading is something we take for granted. But many people have had to _____ this pleasure because of poor eyesight.
A．give in
B．give off
C．give out
D．give up
自动调节装置由哪几部分组成？各部分各起什么作用？
