更多"介绍midden early settlers ate huge bi"的相关试题:
[简答题]Part 1Birds
Do you like birds
What kinds of birds are there where you live
Are there many birds around your neighborhood
In your country, do birds have special meaning
Do you think we should protect birds
[简答题]机场的情况介绍，另外要新造一个机场，比较site A和B的选址。 including birds
[填空题]Birds, flowers, mammals.
[简答题]frog因为人类失去habitat
Birds
[填空题]Who ate the fish in the end
[单项选择] The first birds appeared during late Jurassic times. These birds are known from
four very good skeletons, two incomplete skeletons, and an isolated feather, all from
the Solnhofen limestone of Bavaria, Germany. This fine-grained rock, which is
extensively quarried for lithographic stone, was evidently deposited in a shallow
(5) coral lagoon of a tropical sea, and flying vertebrates occasionally fell into the water
and were buried by the fine limy mud, to be preserved with remarkable detail In this
way, the late Jurassic bird skeletons, which have been named Archaeopteryx, were
fossilized. And not only were the bones preserved in these skeletons, but so also
were imprints of the feathers. If the indications of feathers had not been preserved in
(10) association with Archaeopteryx, it is likely that these fossils would have been
classified among the dinosaurs, for they show numerous theropod characteristics.
Archaeopteryx were animals about t
A. indications
B. fossils
C. dinosaurs
D. characteristics
[单项选择]We ate in the （ ） restaurant.
A. new unusual Chinese
B. unusual new Chinese
C. Chinese unusual new
D. new Chinese unusual
[填空题]
Early to bed, early to rise, makes a
man healthy, wealthy (富有的) and wise (聪明的).
This is an old
English saying. Have you ever heard it before It means that we must go to
bed early and get up early in the morning. Then we shall be healthy, and we
shall also be rich and clever. This is true. The body must have enough sleep to
be healthy. Children at young ages should have ten hours’ sleep every night.
Children who do not have enough sleep can not do their work very well. They will
not be clever and they may not become rich.
The body also needs
exercise. Walking, running, jumping, swimming and playing games are all
exercise. Exercise keeps the body strong. Exercise also helps the blood (血液) to
move around inside the body. This is very important. Our blood takes food to all
parts of our body. The head also needs blood. Exercise helps us to think
[单项选择] Passage Four
Birds are literally half-asleep-with
one brain hemisphere alert and the other sleeping, according to a new study of
sleeping ducks.
Earlier studies have documented half-brain sleep
in a wide range of birds. The brain hemispheres take turns sinking into the
sleep stage characterized by slow brain waves. The eye controlled by the
sleeping hemisphere keeps shut, while the wakeful hemisphere’s eye stays open
and alert. Birds also can sleep with both hemispheres resting at once.
Decades of studies of bird flocks led researchers to predict extra
alertness in the more vulnerable, end-of-the-row sleepers. Sure enough, the end
birds tended to watch carefully on the side away from their companions. Ducks in
the inner spots showed no preference for gaze direction.
Also,
birds dozing (打盹) at the end of the line resorted to single-h
A. half-brain sleep is found in all kinds of birds
B. half-brain sleep is characterized by accelerated brain waves
C. birds can control their half-brain sleep consciously
D. birds always sleep with the whole of their brain at rest
[单项选择]The linear flight formations of migratory birds are called echelons. The V and the J structures are typical and are the most readily recognized flock echelons, but other variations also occur. Studies of several species have shown that a true V-shaped echelon is, in fact, less common than a J formation is.
There are two well-supported and complementary explanations for why birds fly in formation. One is to conserve energy by taking advantage of the upward vortex fields created by the wings of the birds in front. The other is to facilitate orientation and communication among the birds. These explanations are not mutually exclusive, and both have been backed by a variety of studies. The relative importance of each undoubtedly shifts as various factors, such as the season of the year or the purpose of individual flights, change. During local feeding flights, for example, energy conservation is probably much less important than careful orientation and collision avoidance are. During l
A. It can help optimize orientation.
B. Birds can better avoid collision.
C. The reason is still unclear.
D. Birds can’t determine one leader.
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