4 . Last year in a cross-country race in Sanqing Mountain, Gentian left everybody far behind, but unexpectedly he felt a sharp pain and saw that there were teeth marks and blood on his calf (腿肚子).    1    But he didn't know that it was a poisonous snake called ''five-step snake'' in Chinese that bit him.

Deep in the mountain, with no phone, Gentian kept running with the injury on his leg for 15 minutes and finally met a local farmer.    2    He happened to know about herbs and medicine. Immediately, he used some herbal medicine to deal with it. Later, the organizing committee's ambulance rushed to take him to the local hospital.

What should you do if you encounter a snake while outside? Remember: first of all, do not excite it. Data show that people who excite snakes are easily bitten.    3    Second, avoid the places where snakes like to stay. Snakes like to bathe in the sun during the day, and usually stay on gravel and cliff edges. Third, if you happen to see a snake crossing through the road, you must stop and wait for it to pass.

    4    First, sit down and try to avoid the acceleration of blood circulation. Then tie the limb 10-30cm above the wound with a strong rope, and curitopenabout1cm above the wound. The cut should be 1-2cm wide, and squeeze blood from top to bottom. Generally, snakebites occur at the ankle.     5     Also, make sure to call the ambulance ASAP.

A．He sensed that his situation was not good.

B．Then what to do if you're bitten by a snake?

C．So staying still can prevent you from meeting a snake.

D．He thought his high end shoes could protect against the snake.

E．However, those who run immediately are less likely to be bitten.

F．In this case bending the knee to reduce blood flow can be helpful.

G．Despite the language barrier, he understood what had happened.

5 . A rocket problem that forces astronauts to evacuate (撤退) may appear to be a plot straight out of a Hollywood movie. However, that is exactly what happened to Russian astronaut Alexey Ovchinin and American astronaut Nick Hague.     1    

The event happened shortly after the Soyuz rocket and its Soyuz MS-to space capsule (联盟号太空舱) carrying the astronauts took off from Baikonur Cosmodrome, Kazakhstan.     2    

The takeoff went off smoothly, but just 119 seconds later, officials from Russia’s space agency informed NASA the booster (助推器) had failed to separate from the capsule.     3     Instead, they were ordered to evacuate by separating the capsule and returning to Earth in what is known as a ballistic descent mode (弹道下降模式). The sharp drop is similar to free-falling from the skies and subjects astronauts to high levels of g-force.

    4     They appeared to be in excellent condition when they crash-landed about 20 kilometers east of Dzhezkazgan, Kazakhstan, just 34 minutes after they stopped the task. Upon arrival, they were quickly found by the rescue team from Baikonur Cosmodrome and taken to the hospital for a quick check-up to ensure they had not suffered any injuries during their rough ride back to Earth.

It will take a few weeks for experts to determine what caused the problem of the usually reliable Soyuz rocket.     5     Hague, who was on his way to the space station for the first time later joked, “I imagined that my first trip to outer space was going to be a memorable one. I didn’t expect it to be quite this memorable.”

A．To their sadness, this event became a nightmare for their future space journey.

B．The two scientists were on their way to carry out a six-month task at the International Space Station.

C．Surprisingly, the harrowing event has not stopped Hague’s and Ovchinin’s wish to go to space.

D．Thus, the astronauts didn’t head to the International Space Station.

E．And luckily, they became the main characters of the movie about space exploration.

F．Fortunately, the “movie” had a happy ending with both scientists returning to Earth safely.

G．Fortunately, Hgue and Ovchinin had been well-trained for such emergencies.

6 . Any car accident is frightening, but an accident in which your vehicle is thrown into the water, with you trapped inside, is absolutely terrifying.     1    However, most deaths result from panic, without a plan or understanding what is happening to the car in the water. By adopting a brace(支撑) position, acting decisively and getting out fast, you can save yourself from a sinking vehicle.

Brace yourself for impact (撞击力). As soon as you're aware that you're going off the road and into a body of water, adopt a brace position. The impact could set off the airbag system in your vehicle, so you should place both hands on the steering wheel in the “ten and two” position.

Undo your seat belt.     2     Unfasten the children, starting with the oldest first. Forget the cell phone call. Your car isn’t going to wait for you to make the call.

    3     Leave the door alone at this stage and concentrate on the window. A car’s electrical system should work for up to three minutes in water, so try the method of opening it electronically first. Many people don’t think about the window as an escape option either because of panic or misinformation about doors and sinking.

Break the window. If you aren’t able to open the window, or it only opens halfway, you’ll need to break it with an object or your foot. It may feel counterintuitive (有悖常理的) to let water into the car.     4    

Escape when the car has equalized. If it has reached the dramatic stage where the car cabin has been filled with water and it has become balanced, you must move quickly and effectively to ensure your survival.     5     While there is still air in the car, take slow，deep breaths and focus on what you’re doing.

A．Open the window as soon as you hit the water.

B．Surviving a sinking car is not as difficult as you think.

C．It takes 60 to 120 seconds for a car to fill up with water usually.

D．Such accidents are particularly dangerous due to the risk of drowning.

E．In conclusion, if you know what to do in the water, you will be safe.

F．This is the first thing to attend to, yet it often gets forgotten in the panic.

G．But the sooner the window is open, the sooner you can escape directly through it.

7 . 根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
If you are in a crowd, the first and most important thing is to make yourself familiar with your surroundings and mentally notice alternate exits.    1    Make yourself aware of the type of ground you are standing on, and know that in a crowd of moving people wet or uneven ground can be slippery or hazardous, causing you to fall.    2    When in danger, a few seconds can make all the difference, giving you the possibility of taking advantage of escaping route. Always stay closer to the escape route.If you find yourself in the middle of a moving crowd, do not fight against the pressure, do not stand still or sit down, because you could easily get trampled.    3    Take advantage of any space that may open up to move sideways to the crowd movement where the flow is weaker.Keep your hands up by your chest, like a boxer—it gives you movement and protects your chest.    4    If you cannot get up because you are injured, get someone to pull you back up. If you have kids, lift them up.If you fall and cannot get up, keep moving by crawling in the same direction of the crowd, or if that is not possible, then cover your head with your arms and curl up into fetal position.    5    

A．Be aware of the general atmosphere of the event, as panic situations can often be expected.

B．There is always space between people.

C．Do not lie on your stomach or back, as this dangerously exposes your lungs.

D．The worst is to be pushed by the crowd against an immovable object

E．If you fall, get up quickly.

F．No matter where you are, make sure you always know how to get out.

G．Instead, move in the same direction of the crowd.