A: Because low pressure can cause the air in body cavities to expand.
B: Because medical devices implanted in their bodies expand.
C: Because they tend to sit too long in a cramped position.
D: Because the amount of oxygen flowing through their blood vessels is reduced and thus causing chest pains.
举一反三
- Why is heart disease the most dangerous killer in the United States A: Because American people drink too much spirits. B: Because there are a great number of fat people there. C: The author doesn't give a definite answer. D: Because American people eat too much fatty fish.
- Why do people in developed countries travel more A: Because they like adventures more. B: Because they enjoy the fresh air more. C: Because they have more holidays. D: Because they are richer.
- 2016-12-19 A: Because the salary is too low B: Because the company is too small C: Because she has to travel abroad frequently D: Because a tour guide has to work long hours.
- Why do people usually stop flying after terrorist attacks（） A: Because they are terrified of flying. B: Because they believe in rational risk assessment. C: Because their palms will become too sweaty for them to fly. D: Because they can’t decide which airline will be the safest.
- Why is yoga regarded by some people as the ultimate workout A: Because you have to do meditation all through the practice time. B: Because there are many modern versions of yoga as well as traditional ones. C: Because it involves both your body and your mind.
内容
- 0
Why do people in some countries not react negatively to<br/>corruption?___ A: because they feel it cannot be avoided B: because they want reform C: because almost everyone in the government is corrupt D: because they have paid money to gain influence
- 1
Why does a lack of sleep cause people to gain weight A: Because people burn fewer calories when they are awake. B: Because people feel hungry when they lack sleep. C: Because their hormones stay unchanged. D: Because people don"t exercise when they don"t have enough sleep.
- 2
Why did the fox fall into the fiver A: [A] Because he was taking a walk. B: Because he wanted to drink some water. C: Because it was too dark.
- 3
Why can’’t the library issue library cards to everyone who applies A: Because it takes too long to process all the applications. B: Because it is a library for special purpose. C: Because its resources are limited. D: Because there is a shortage of staff.
- 4
Why do Chinese parents demand perfect grades from their child? A: Because they believe that their child can get them. B: Because they respect their child self-esteem. C: Because they do not want their child feel inferior. D: Because they assume that their child does not work hard.