閱讀海報，選擇正確的選項(xiàng)。
   *Put the screen （屏幕） 45-80 cm from your eyes.
   *Try to reduce reflections（減少反光）.
   a.Don't use a computer in the sun.
   b.Don't put a light behind you.
   *Take breaks（休息）
    a.Follow the "20/20/20" rule when taking a break：After 20 minutes of computer use，look at something 20 feet （英尺） away for more than 20 seconds （秒）.
   b.Take more breaks after looking at the screen for a long time.You should take more than one 15-minute break after 2 hours of computer use.
   *Do eye exercises.
Step 1：Slowly move eyes up and then down.
Step 2：Do Step 1 three times.
Step 3：Slowly move eyes to the left and then to the right.
Step 4：Do step 3 three times.
（1）This is a

C

C

.
A．diary
B．letter
C．poster
（2）You should put your screen

B

B

from your eyes.
A．40 cm
B．60 cm
C．90 cm
（3）Which one can reduce reflections？

C

C

A．
B．
C．
（4）Which one is NOT true？

B

B

A．After 20 minutes of computer use，look at something 20 feet away for 30 seconds.
B．After 20 minutes of computer use，look at something 15 feet away for 15 seconds.
C．Take one 20-minute break after using your computer for 2 hours.
（5）The right order of eye exercises is

B

B

.
a.
b.
c.
d.
A．a(chǎn)babab→cdcdcd
B．a(chǎn)cacac→bdbdbd
C．cacaca→dbdbd