1.When it comes to cheetahs, speed kills.
2.Every mammal's brain contains a pleasure center.
3.Just how close an animal's emotions are to ours may never be known.
4.More teenagers and young adults die from suicide than from cancer, heart disease, AIDS, birth defects, stroke, pneumonia, influenza, and chronic lung disease combined.
5.Like humans, baboons harass each other, compete for rank, and undergo stress.
6.The illicit drug or alcohol use can make mental health problems worse, or even interfere with medications prescribed to treat the mental illness.
7.The escalating battle for space on this planet between people and wild animals has grown increasingly one-sided, as humanity asserts its domination.
8. When a female elephant gives birth, high levels of oxytocin (后叶催产素) are released into her bloodstream, which is responsible for parenting behavior.
9.Each year the great white sharks turn up at the same place at the same time, occasionally crossing paths with humans who still swim and surf in these dangerous waters.
10. During hypothermia, the heart sometimes lost its regular pumping beat, but fribrillated (纤维性颤动) , or fluttered and trembled uselessly; and this fibrillation could cause death if the beat could not be restored.
11.Japan plans to formally launch its manned spaceship in the year 2020.
12.It is said that the price of the suits worn by the astronauts equals that of a luxurious car.
13.Even the most complicated computer man has built can't compare in intricacy with the brain.
14.Space technology should be combined with civilian life to develop various high-tech products.
15.A mountain road is made as an inclined plane in order to make the slope more gradual.
16.As the earth's buffer, the ocean maintains a fine balance between the many salts and gases which make life possible.
17.The new generation of carrier rockets being developed in China is characterized by great thrust, high reliability, low cost, and is poison and pollution free.
18.Without a steady supply of fresh blood, without the oxygen it carries, the human brain is quickly impaired.
19.The scope of mankind's activities has expanded from land to ocean, from ocean to atmosphere, and eventually from atmosphere to outer space.
20.Resource exhaustion, environment degradation and population explosion are the three major global problems confronting human beings, while space technology might become an important means of solving these problems.