题目内容
阅读下面短文,从每小题所给的A、B、C、D四个选项中选出最佳选项,并在答题卡上将该项涂黑。
Have you ever jumped into the water and tried to hold your breath? Take it a few steps further and you could join a growing sport.
Free-diving has become popular in Europe and the United States. Free divers try to best each other by diving either the deepest or the longest. These divers are pushing their lungs to the limit.
In June 2000 a Frenchman set the world record with his 450-feet dive. Another Frenchman set the world record for the longest time underwater. He stayed underwater for seven minutes and thirty-five seconds! Both men did it with a single breath of air.
Free diving takes a lot of training. Divers relax their body to hold their breath. They also have methods to pump more air into their lungs, much like blowing up a balloon. They copy the same underwater environment and practice and practice and practice.
Divers need to prepare because the sport is filled with danger. At deep levels water pressure force the lungs to release their air. When the diver returns to the surface water pressure can cause “the bend.” This is when air does not get to the brain.
Marine mammals have none of these problems. Their blood allows them to stay underwater for up to two hours with one breath of air. Free divers are learning from these animals. Every year they are getting just a little closer to moving like them underwater.
1.Free-diving becomes popular in Europe and the USA for ________.
[ ]
A.diving is an easy sport which takes only a few steps to practice
B.many people there love to take part in this kind of sport
C.diving competitions are usually held there
D.people in Europe and the USA are good at diving
2.People compete in order to prove ________.
[ ]
A.how fast a diver can dive underwater ________.
B.how long a diver can hold his breath underwater
C.how well a diver can learn from sea animals in diving
D.how much air a diver can pump into their lungs
3.Diving is a sport filled with danger because ________.
[ ]
A.divers are pushing their lungs to the limit
B.it needs a lot of training before diving
C.the divers go too deep into the water
D.the water pressure can lead to “the bend”
4.The best way to be a good diver is to ________.
[ ]
A.practice every day
B.learn from other good divers
C.do as the sea animals
D.have big enough lungs