Students in China are required to learn first aid at school as part of health education.It aims to improve their（1） （能力） to deal with a first aid emergency （紧急情况）.
According to a survey，there is one sudden death each minutes because the person's heart（2） （stop ） beating.A sudden loss of heart working will lead to brain damage （损害） within four to six minutes and then death after another five minutes.So，it is very（3） for the patients to receive car within four to six minutes.However，only about 4.5% of such patients have a chance of receiving it（4） time.That's because besides medical workers，most people do not have knowledge of first aid.In fact，about 60% of these（5） （accident ） happen out of hospital，so it's necessary for more people to learn the skill of first aid including car.That can make a huge difference in saving lives.
A bus ran off a bridge into the Yangtze River in Chongqing on October 28， 2018．The accident（1） （cause） by a fight between the driver and a passenger， killing all 15 people on the bus．
According to the police report， a 48﹣year﹣old female passenger， surnamed Liu，argued with the driver， surnamed Ran． Liu was angry because Ran refused（2） （stop） the bus after she missed her station． She then hit the driver， causing the accident． The video shows that Liu hit Ran with her mobile phone twice while Ran（3） （drive） the bus． Rather than stop in the middle of the road， Ran kept driving． But in protecting himself， he lost control of the bus and a tragedy（悲剧）happened．
The police said that both Liu and Ran had broken criminal law by seriously endangering （危及） public safety． And the police（4） （announce），"Liu hit the driver with her phone and prevented the driver from driving the bus safely． The driver，too， didn't do his best to make sure that his driving was safe．"
The accident also caused heated discussions on the Internet． Besides feeling terribly sorry for the tragedy， most Internet users blamed （指责） Liu， while some others criticized the driver．More users were talking about what they should do One Weibo user said， "We（5） __ （stand）up and stop such fights between passengers and drivers（6） （avoid）this kind of tragedy．"Another user advised that a safety barrier （屏障）should be set up on the bus． It can stop passengers from（7） （touch） the bus driver．
There are about 6，000 languages that are spoken around the world， but 43% of them are dying out． If no is taken， some of these languages will disappear． （act）
Have you ever cut your finger on the edge （边缘）of a book page？ The small cut on your finger is so （pain）．
Scientists around the world are working to a medicine for AIDS（艾滋病）． （ cover）
A team of climbers from Peking University reached the top of the world's mountain，Qomolangma， on May 15， 2018． （high）