Every living thing has an inner
biological clock that controls behavior. The clock works all the time even when
there are no outside signs to mark the passing of time. The biological clock
tells plants when to form flowers and when the flowers should open. It tells
insects when to leave the protective cocoon and fly away. And it tells animals
when to eat, sleep and wake. It controls body temperature, the release of
some hormones and even dreams. These natural daily events are circadian
rhythms. Man has known about them for thousands of years. But
the first scientific observation of circadian rhythms was not made until 1729.
In that year French astronomer, Jean-Jacques d’Ortous de Mairan, noted that one
of his plants opened its leaves at the same time every morning, and closed them
at the same time every night. The plant did this A. even when it was kept in a murky place all day B. even if it was placed in the moonlight C. even when he was observing it from a dark place D. even during the night time
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[单项选择] Passage Two
Every living thing has an inner
biological clock that controls behavior. The clock works all the time even when
there are no outside signs to mark the passing of time. The biological clock
tells plants when to form flowers and when the flowers should open. It tells
insects when to leave the protective cocoon and fly away. And it tells animals
when to eat, sleep and wake. It controls body temperature, the release of
some hormones and even dreams. These natural daily events are circadian
rhythms. Man has known about them for thousands of years. But
the first scientific observation of circadian rhythms was not made until 1729.
In that year French astronomer, Jean-Jacques d’Ortous de Mairan, noted that one
of his plants opened its leaves at the same time every morning, and closed them
at the same time every night. The plant did this A. the regulation of body temperature B. the secretion of hormones C. animal reproduction D. many aspects of plant and animal physiology
[单项选择] Text 1
Every living thing has an inner
biological clock that controls behavior. The clock works all the time; even when
there are no outside signs to mark the passing of time. The biological clock
tells plants when to form flowers and when the flowers should open. It tells
insects when to leave the protective cocoon and fly away. And it tells animals
when to eat, sleep and wake. It controls body temperature, the release of some
hormones and even dreams. These natural daily events are circadian
rhythms. Man has known about them for thousands of years. But
the first scientific observation of circadian rhythms was not made until 1729.
In that year a French astronomer, Jean Jacques d’Ortous de Mairan, noted that
one of his plants opened its leaves at the same time every morning, and closed
them at the same time every night. The plant did th A. every creature has an inner biological clock. B. the biological clock works day and night. C. the biological clock has circadian rhythms. D. the biological clock regulates behavior of creatures.
[单项选择]
A Biological Clock
Every living thing has what scientists call a biological clock that controls behavior. The biological clock tells (1) when to form flowers and when the flowers should open. It tells (2) when to leave the protective cocoons and fly away, and it tells animals and human beings when to eat, sleep and wake.
Events outside the plant and animal (3) the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur (4) the number of hours of daylight. In the short (5) of winter, its fur becomes white. The fur becomes gray brown in color in the longer hours of daylight in summer.
Inner signals control other biological clocks. German scientists found that some kind of internal clock seems to order birds to begin their long migration (6) twice each year. Birds (7) flying become res A. prevented from B. helped by C. intruded on
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