单项选择题

Botany, the study of plants, occupies a peculiar position in the history of human knowledge. We don’t know what our Stone Age ancestors knew about plants, but from what we can observe of preindustrial societies that still exist, a detailed learning of plants and their properties must be extremely ancient. This is logical. Plants are the basis of the food pyramid for all living things, even for other plants. They have always been enormously important to the welfare of people, not only for food, but also for clothing, weapons, tools, dyes, medicines, shelter, and many other purposes. Tribes living today in the jungle of the Amazon recognize hundreds of plants and know many properties of each. To them botany has no name and is probably" not even recognized as a special branch of "knowledge" at all,
"Botany" is the science that

A. studies existing tribes.
B. studies ancient way of living.
C. studies preindustrial societies.
D. studies plants.
<上一题 目录 下一题>
热门 试题

单项选择题
They are giant geometric patterns, which appear over-night in a field of crops. Many people believe that they are made by aliens. Others call them hoaxes. Crop circle , as the mysterious patterns are called, became a hot phrase this month. A strange pattern 360 feet (110 meters) in diameter was discovered earlier this month in a wheat field in Oxfordshire, England. It’s believed to be the world’s first three-dimensional crop circle. The giant crop circle gives an impression of looking down on skyscrapers from above. The design’s discovery immediately generated a new tide of public interest in this mysterious phenomenon. Crop circles were first widely noticed in the late 1970s as many mysterious circles began appearing in crop fields throughout the English countryside. People were intrigued by these giant patterns. They were huge (at least tens of meters in diameters) and popped up over-night. No one knew how or by whom they were made. The world’s first three-dimensional crop circle appeared
A. in a wheat field in Oxfordshire.
B. throughout the countryside of Oxfordshire.
C. in the English countryside in the 1970s.
D. in all the wheat fields in the English countrysid
单项选择题
What are feelings for Most nonscientists will find this a strange question. Feelings just are. They justify themselves. Emotions give meaning and depth to life. They need serve no other purpose in order to exist. On the other hand, many evolutionary biologists, in contrast to animal behaviorists, acknowledge some emotions primarily for their survival function. For both animals and humans, fear motivates the avoidance of danger, love is necessary to care for young, and anger prepares one to hold ground. But the fact that a behavior functions to serve survival need not mean that that is why it is done. Other scientists have attributed the same behavior to conditioning, to learned responses. Certainly reflexes and fixed action patterns can occur without feeling or conscious thought. A gull chick peeks at a red spot above it. The parent has a red spot on its bill(喙); the chick peeks the parent’s bill. The gull parent feeds its chick when pecked on the bill. The baby gets fed. The interaction need have no emotional content. Many evolutionary biologists believe that
A. emotions do not exist.
B. emotions contribute to survival.
C. emotions don’t give meaning and depth to life.
D. only humans are capable of emotions.
相关试题