下列能引起期前收缩的时期是A．绝对不应期 B．局部反应期 C．收缩期 D．舒张早期

In the weeks ________, we will say good bye to our dear teachers and friends at this great school.

A．following

B．followed

C．to follow

D．that followed

若△ABC的三边长为a，b，c，根据下列条件判断△ABC的形状。

（1）a²+b²+c²+200=12a+16b+20c

（2）a³-a²b+ab²-ac²+bc²-b³=0

对已生效的处罚决定，当事人拒不履行的，由作出处罚决定的（）依法强制执行或申请（）强制执行。

Below is some advice on how to sleep better.

1. Maintain a regular bed and wake time schedule

Go to bed at the same time every night. Choose a time when you normally feel tired, so that you don’t toss or turn. Try not to break this routine on weekends when it may be tempting to stay up late. If you want lo changeyour bedtime, help your body adjust by making the changein small daily increments, such as 15 minutes earlier or later each day. As with your bedtime, try to maintain yourregular wake-time even on weekends.

2.Fight after-dinner drowsiness（睡意）

If you find yourself getting sleepy before your bed-time, get off the couch and do something mildly stimulating to avoid falling asleep, such as washing the dishes, calling a friend, or getting clothes ready for the next day. If you give in to the drowsiness, you may wake up later in the night and have trouble getting back to sleep.

3. Keep your room dark and cool

When it’s time to sleep, make sure that your environment is dark. Even dim light —especially those from TV or computer screens —can confuse the body clock. Heavy curtains or shades can help block light from windows, or you can try an eye mask to cover your eyes. The temperature of your bedroom also affects sleep. A bedroom that is too hot or too cold can interfere with quality sleep.

4. Turn off your television

Many people use the television to fall asleep or relaxat the end of the day. You may even have a television inyour bedroom. However, television actually stimulates themind, rather than relaxing it. Part of this is due to con­tent. Late night news and prime time shows frequently have disturbing, violent material. Even non-violent pro­gramming can have commercials that are jarring and loud.

5. Exercise early

Exercise helps promote restful sleep if it is done sev­eral hours before you go to bed. Exercise can help you fall asleep faster and sleep more soundly— as long asit ’s done at the right time. Try to finish exercising at least three hours before bed or work out earlier in the day.

6. Consult your doctor

Use a sleep diary and talk to your doctor. Note what type of sleep problem is affecting your sleep or if you aresleepy when you wish to be awake and alert. Try these tips and record your sleep and sleep-related activities in a sleep diary. If problems continue, discuss the sleep diary with your doctor. There may be an underlying cause and you will want to be properly diagnosed. Your doctor will help treat the problem or may refer you to a sleep specialist.

小题1:To prevent yourself from sleeping too much on weekends, you should________.

A．go lo bed 15 minutes earlier than usual

B．go to bed at usual time

C．go to bed at any time

D．make an adjustment to your bedtime小题2:Which of the following makes it easier for you to have a sound sleep?

A．Watching violent programmesbefore going to bed.

B．Changing your bedtime only a little every day.

C．Using heavy curtains or an eye mask to block light.

D．Completing your workout just before bedtime.小题3:The following ways can help fight after-dinner drowsinessEXCEPT_______.

A．making a telephone call

B．doing some washing

C．getting clothes ready for the next day

D．having a rest on the sofa小题4: If your sleep problems continue, you’d better_____________

A．move into a new house

B．discuss it with your family

C．change your present job

D．turn to the doctor for help

齿轮综合检查仪分为双面啮合检查仪和单面啮合检查仪两种。