题目内容
（请给出正确答案）
[单选题]
单项选择What's that__（）
A.It's a bird
B.They are birds
C.It's yellow
答案
I
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题目内容
（请给出正确答案）
答案
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.It's a bird
B.They are birds
C.It's yellow
答案
I
如果结果不匹配，请 联系老师 获取答案
更多“单项选择What's that__（）”相关的问题
Not long age, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly by night？ Tests with artificial stars have proved that certain night - flying birds are able to follow the stars in their long - distance flights.
A dove (鸽子) had spent its lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The bird's cage was placed under an artificial star - filled sky. (76) The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the artificial stars caused a change in the direction of his flight.
(77) But the stars are apparently their principal means of navigation (航行) only. When the stars are hidden by clouds, they seemingly find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it's too dark to see these, the doves circle helplessly, unable to find their way.
The reason why birds don't get lost on long flights ______.
A．have been known to scientists for many years
B．have only recently been discovered
C．are known by us
D．will probably remain a mystery
A.the deforestation of the Amazon
B.the destruction of biodiversity
C.the desertification of the Amazon
D.the rare species of birds
根据以下内容回答题：
No one knows for sure why birds migrate．One theory of migration says that ancient birds of the northern part of the earth were forced southward during the Ice Age，when ice covered large parts of Europe，Asia and North America．As the ice melted，the birds came back to their homelands，spent the summer，and then went south again in winter．Gradually，these comings and goings became habits，and birds now migrate though much of the ice has gone． Another theory proposes that the ancient home of all modern birds was the tropic areas．There lived so well that the region became overcrowded．Many species had to move northward．During the summer，these birds found plenty of room and food．In winter，however，food be-came scarce and they had to return to the south． A newer theory is that increasing daylight stimulates certain glands（腺）in the bird’s body and prepares it for migration．One scientist is able to make birds migrate in midwinter by expo-sing them for two months to artificial daylight．Recoveries of marked birds indicate that they fly north as soon as they are set free．The conclusion is that the urge to migrate is determined by changes in the bird’s body which take place under seasonal changes in the length of daylight． This theory would account for the fact that not all birds migrate at the same time．Each sDecies seems to have its own schedule．The theory would also account for the regular time and rou‘tes of migration．Birds arrive at a given place year after year．Unfavorable weather delays them only a few days．Total hours of daylight，rather than weather，start them on the way． How birds find their way to the same place year after year and why they follow their own Darticular route are still mysteries．They evidently do not follow known landmarks，for many young birds migrate alone without the help of experienced adults．
We can conclude from the first paragraph that__________ ．
A.during the Ice Age，the whole Europe was covered with ice
B.the south used to be the homelands of all birds
C.scientists can confidently explain why birds migrate now
D.migration of birds can be explained by the change of ice on earth
根据以下材料回答 1～20 题：
Directions:
Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. (10 points)
Research on animal intelligence always makes me wonder just how smart humans are___(1)___the fruit-fly experiments described in Carl Zimmer’s piece in the Science Times on Tuesday. Fruit flies who were taught to be smarter than the average fruit fly __(2)__to live shorter lives. This suggests that __(3)___ bulbs burn longer, that there is a(n)___(4)___in not being too terrifically bright.
Intelligence, it ____(5)_ , is a highpriced option. It takes more upkeep, burns more fuel and is slow___(6)___ the starting line because it depends on learning—a (an) ____(7)_ process—instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to __(8)____.
Is there an adaptive value to __(9)___intelligence？ That’s the question behind this new research. I like it. Instead of casting a wistful glance__(10)____at all the species we’ve left in the dust I.Q.wise, it implicitly asks what the real____(11)__of our own intelligence might be. This is__(12)___the mind of every animal we’ve ever met.
Research on animal intelligence also makes me wonder what experiments animals would__(13)___on humans if they had the chance. Every cat with an owner, ___(14)___, is running a small-scale study in operant conditioning. We believe that__(15)____animals ran the labs, they would test us to___(16)___the limits of our patience, our faithfulness, our memory for terrain. They would try to decide what intelligence in humans is really__(17)__, not merely how much of it there is.__(18)___, they would hope to study a__(19)__question: Are humans actually aware of the world they live in？__(20)____the results are inconclusive.
第 1 题 请选择(1)处最佳答案（）。
A．Suppose
B．Consider
C．Observe
D．Imagine
Deer leave the high ground and come down from the mountains before a storm.If you see this, you can be sure that there will be a storm within two days.When you see large numbers of sea crabs on a sandy beach, it is time to leave.A change in air pressure over the water warns the crabs that a storm is coming.To escape the stormy sea pounding the shore, they leave the water and seek shelter on land.
Birds are especially good weather indicators because they also show the effect of a pressure drop in many ways.For example, some birds become easily annoyed and will fight over a piece of bread.Other birds sing just before a storm.It seems they know they won't get another chance for an hour or two.Birds also seek shelter before a storm.You will sometimes see birds resting in trees or staying closely together on a wire near a building.This is a good storm signal.
Seabirds sit out a storm on land.Anytime you see seagulls sitting on the ground in large groups, reluctant to fly, it is not a very good day to go sailing.It is unusual to see large groups of birds flying overhead in the summertime.Watch for other weather signs if you see this.You should also stay alert if you see migrating birds flying in the wrong direction.These birds may be flying ahead of a storm.And if you can't see a bird anywhere, look out! They may have flown to a different place because a violent storm is coming in their direction.
1.What's the main idea of the passage？
A.How to pay close attention to important clues in nature.
B.How to become prepared for any kind of weather.
C.How to predict weather changes by wildlife.
D.What to do when we see the weather signs.
2.When a storm is surely coming in two days, ________.
A.some birds become easily annoyed and fight with each other
B.deer leave the high ground and come down from the mountains
C.large number of sea crabs move on a sandy beach
D.field mice come out of their holes and run around
3.What wildlife indicates particularly well that a storm is coming？
A.Seagulls.
B.Sea crabs.
C.Field mice.
D.Birds.
4.How can you know it's not a good day to go sailing？
A.Migrating birds are flying in the wrong direction.
B.You can't see a bird anywhere.
C.Seagulls are sitting on the ground in large groups.
D.Birds are flying overhead in the summertime.
5.What does the want to say？
A.Wildlife is a good helper to predict the weather.
B.Wildlife is more efficient in predicting the weather.
C.People need to find out about the weather change.
D.Get prepared before a violent storm is coming.
A.Is there a bedroom in our new home
B.What’s in our new home
C.How many bathrooms in our new home
