问题 单项选择题

不适于作根管治疗的是()。

A.近5个月患有心肌梗死的患者

B.糖尿病患者

C.牙科焦虑症患者

D.艾滋病患者

E.妊娠中期的孕妇

答案

参考答案:A

解析:严重心血管疾病患者的牙髓病急诊,应与心血管专家会诊后处理。对于风湿性心脏病、先天性心脏病、心脏杂音或做过心脏换瓣等手术的患者,应注意避免因根管治疗引起感染性心内膜炎,并应用抗生素预防,近6个月内患有心肌梗死的患者不适宜做牙髓治疗。

阅读理解

If you get lost, this is what you should do. Sit down and stay where you are. Don’t try to find your friends—let them find you. You can help them find you by staying in one place. There is another way to help your friends or other people to find you. You can shout or whistle (吹口哨)three times. Stop. Then shout or whistle three times again. Any signal(信号)for three times is a call for help.

Keep up shouting or whistling. Always three times together. When people hear you, they will know that you are not just making a noise for fun. They will let you know that they have heard your signal. They will give you two shouts or two whistles. When a signal is given twice, it is an answer to a call for help.

If you don’t think that you will get help before night comes, try to make a little house with branches(树枝. Make yourself a bed with leaves and grass.

When you need some water, you have to leave your little branch house to look for it. Don’t just walk away. Pick off small branches and drop them as you walk in order to go back again easily. When you are lost, the most important thing to do is to stay in one place.

小题1:If you get lost in the forest, you should___________.            

A.try to find your friends

B.stay in one place and give signals

C.walk around the forest

D.shout as loudly as possible小题2:Which signal is a call for help?    

A shouting here and there         B. shouting or whistling three times together

C. crying twice                   D. whistling every where in the forest

小题3:When you hear two shouts or two whistles, you know that_____.

A.someone is afraid of an animal

B.people will come to help you

C.someone needs help

D.something terrible will happen小题4:What’s the meaning of the underlined sentence?(划线句子)

A.Drop branches to find your way back

B.Pick off branches to build another house

C.Use branches to make a bed

D.Drop branches to look for water小题5:The main(主要的)idea of the passage is_____________.

A.how to travel in the forest

B.how to spend the night in the forest

C.what you should do if you want to get some water

D.what you should do if you are lost in the forest

单项选择题