更多"In winter, animals have a hard time"的相关试题:
[单项选择]In winter, animals have a hard time________ anything to eat.
A. to find
B. to finding
C. to find out
D. finding
[单项选择]
An Interesting Phenomenon
Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without vitamins even though there is no difference in taste or smell between the two water bottles. When a fragrant flavor was added to the vitamin-enriched fluid, the rats did seem to develop a taste for it and kept drinking it, even after the vitamins were switched to the clear water. In time, however, they broke the habit and went back to where the necessary vitamins were.
In a classic experiment, babies of 6 to 12 months old were placed in a cafeteria feeding arrangement, with a wide selection of baby food before them. They were given whatever food they pointed to or appeared interested in. We are told that at first they showed some unusual eating patterns, but that over a pe
A. encourage rats to drink vitamin-enriched water
B. find out rats preference in flavor
C. test whether rats know which drink is good for them
D. demonstrate that vitamins are tasteless
[单项选择]
An Interesting Phenomenon
Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without vitamins even though there is no difference in taste or smell between the two water bottles. When a fragrant flavor was added to the vitamin-enriched fluid, the rats did seem to develop a taste for it and kept drinking it, even after the vitamins were switched to the clear water. In time, however, they broke the habit and went back to where the necessary vitamins were.
In a classic experiment, babies of 6 to 12 months old were placed in a cafeteria feeding arrangement, with a wide selection of baby food before them. They were given whatever food they pointed to or appeared interested in. We are told that at first they showed some unusual eating patterns, but that over a period
A. encourage rats to drink vitamin-enriched water
B. find out rats preference in flavor
C. test whether rats know which drink is good for them
D. demonstrate that vitamins are tasteless
[单项选择]In winter drivers have trouble stopping their cars from ______ on icy roads.
A. skating
B. skidding
C. sliding
D. slipping
[单项选择]Protests at the use of animals in research have taken a new and fearful character in Britain with attempted murder of two British scientists by the terrorist technique of the pre-planted car-bomb.
The research community will rightly be alarmed at these developments, which have two objectives: to arouse public attention and to frighten people working in research with animals. The first need is that everything should be done to identify those responsible for the crimes and to put them on trial. The Defense Research Society has taken the practical step of offering a reward of 10,000 pounds for information leading to those responsible, but past experience is not encouraging. People are unlikely to be tempted by such offers. The professional police will similarly be confronted by the usual problem of finding a needle in a haystack.
That is why the intellectual community in Britain and elsewhere must act more actively in its own defense. There are several steps that can be t
A. the acts of violence against scientists
B. the use of animals in research
C. the techniques of planting bombs in cars
D. the establishment of new animal protection organizations
[单项选择]Do you know why different animals or pests have their special colors Colors in them seem to be used mainly to protect themselves.
Some birds like eating locusts(蝗虫), but birds cannot easily catch them. Why It is because locusts change their colors together with the change of the colors of crops. When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.
If you study the animal life, you’ll find the main use of coloring is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters. This is because they have the colors much like the trees.
Have you ever found an even more strange act A kind of fish in the sea can send out a kind of very black liquid(液体)when it faces danger. While the liq
A. The Change of Colors for Animals and Pests.
B. Colors of Different Animals and Pests.
C. The Main Use of Colors for Animals and Pests.
D. Some Animals and Pests.