| All mammals require sleep; it
is an essential part of life. For giraffes, two hours a Line day is enough. For bats, that number is closer to twenty. The average adult human needs between seven and nine hours of sleep every day. Despite these differences, mammals all have one thing in common: If they do not get enough sleep, they can (5) suffer serious mental and physical consequences. The most extensive sleep research has been conducted on people. Through these studies, scientists have identified two broad categories of sleep, which can be further divided into five stages with distinct physiological functions. Taken together, they form a complete sleep cycle. The first four stages are marked by a (30) lack of rapid eye movement (REM). Therefore, they are referred to as non-REM< A. (A) promoting mammalian sleep research B. (B) documenting the importance of non-REM sleep in hormone regulation C. (C) describing the role of sleep in human behavior and development D. (D) arguing that humans need more sleep to function optimally E. (E) illustrating the importance of REM sleep to brain function [单项选择]Who has survived the crash
A. Diana’s driver. B. The French judge. C. The bodyguard. D. Diana’s boyfriend. [简答题]part 1
Plane
Have you ever travelled by plane？
How do you feel about travelling by plane？
Are you going to travel by plane in the future？
Where would you like to go？
[单项选择]How many hostages survived the kidnapping
A. 2. B. 4. C. 7. D. 11. 我来回答: 提交
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