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) How do the remaining Ganges River dolphins still exist
B. (B) What is the primary use of the new underwater acoustic technology
C. (C) Why do Ganges River dolphins make their homes in rivers and lakes
D. (D) How does the underwater acoustic technology work
E. (E) Can the new underwater acoustic technology be used in identifying and tracking other species of dolphins
更多"All mammals require sleep; it
is "的相关试题:
[单项选择]
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
[简答题]Nowadays, most universities require students to pay for their education, and the tuition fees have been staying so high that some families cannot afford them. What do you think of the phenomenon Write an essay of about 400 words on the following topic:
[填空题]In order to set the system, you should have all passengers get out of the vehicle.
[填空题]In the United States, the authorities require all financial transactions of over ______ to be reported by way of precaution against money laundering.
[简答题]Some high schools require all students to wear school uniforms.Other high schools permit students to decide what to wear to school.Which of these two school policies do you think is better Use specific reasons and examples to support your opinion.
[单项选择]
All living cells on earth require moisture for their metabolism. Cereal grains when brought in from the field, although they may appear to be dry, may contain 20 per cent of moisture or more. If they are stored in a bin thus, there is sufficient moisture in them to support several varieties of insects. These insects will, therefore, live and breed and, as they grow and eat the grain, it provides them with biological energy for their life processes. This energy will, just as in man, become manifest as heat. Since the bulk of the grain acts as an insulator, the temperature surrounding the colony of insects will rise so that, not only is part of the grain spoiled by the direct attack of the insects but more may be damaged by the heat. Sometimes, the temperature may even rise to the point where the stored grain catches fire. For safe storage, grain must be dried until its moisture content is 13 per cent or less.
Traditional arts of food preservation took advantage of thi
A. consuming all the grain themselves
B. generating heat and raising the surrounding temperature
C. increasing the moisture content in the grain
D. attacking each other for more grain
[单项选择]A. Robert survived the plane crash.
B. All the passengers were killed in the plane crash.
C. Robert was killed in the air crash.
D. Robert is a wonder-working person.
[单项选择] 1 All animals must rest, but do they really sleep as we know it The answer to this question seems obvious. If an animal regularly stops its activities and stays quiet and un moving-if it looks as though it is sleeping—then why not simply assume that it is in fact sleeping But how can observers be sure that an animal is sleeping They can watch the animal and notice whether its eyes are open or closed, whether it is active or lying quietly, and whether it responds to light or sound. These actors are im portant clues, but they often are not enough. Horses and cows, for example, rarely close their eyes, and fish and snakes cannot close them. Yet this does not necessarily mean that they do not sleep. Have you ever seen a cat dozing with an eye partly open Even humans have occasionally been observed to sleep with one or both eyes partially open. Animals do not necessarily lie down to sleep either. Elephants, for example, often sleep standi A. these animals rarely need any rest B. they almost always keep alert to danger C. they often stay awake D. their eyes are rarely closed even when they are asleep
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