How was your sleep last night？World Sleep Day fell on March 17th this year.The topic was "sleep is important for health".How can we have healthy sleep？Take a look at some tips.
    Wake up naturally.Waking up to a ringing alarm is never fun.Studies showed that when you get "shocked" by the alarm，your breathing will go up from 16 to 24 breaths a minute.Your heart will have10 more beats every minute.Your blood pressure will rise.
    "This is a very unhappy way to start the day，" a sleep scientist said.You'll feel worse if you fallback to get a few more minutes of sleep.This will make your body's natural sleep-wake cycle（循環(huán)） go wrong.
    So what should we do？Try to use an alarm with softer and lower sounds，or leave a crack （縫隙） in the curtains-the rising sun will wake you up.
    Sleep early，get up early.Some young people may go to bed late and get up late，such as sleeping from 2 a.m.jye.ai 10 a.m.They think as long as they have 8 hours of sleep，everything will be fine.
    But in fact，our bodies can tell time.They use light and temperature to do so.If we wake up too late，our bodies might feel confused between sleep and being awake.That's why sometimes we feel even more tired after oversleeping.

（1）If you don't wake up naturally，what will happen？

B

B

A．You'll have a good day.
B．Your breathing will go up.
C．Your heart will beat more slowly.
D．Your blood pressure will keep the same.
（2）Which of the following is a healthy way to sleep？

C

C

A．Sleeping from 2 am to 10 am.
B．Sleeping with the light on.
C．Going to bed early and sleeping for 8 hours.
D．Falling back to get a few more minutes of sleep.
（3）What does the underlined word"confused"mean？

B

B

A．Uncomfortable
B．Unclear
C．Unhappy
D．Unusual
（4）What is the structure of the passage？

A

A

A．
B．
C．
D．
（5）The passage mainly talks about

C

C

.
A．how to wake up naturally
B．how to sleep early
C．how to sleep healthily
D．how to keep healthy