[单项选择]Scientists discovered that people's emotions are ______


A. controlled by their facial expression
B. influenced by their facial expression
C. identical with their facial expression
D. contrary to their facial expression

[单项选择]Scientists discovered that people's emotions are ______
A. controlled by their facial expression
B. influenced by their facial expression
C. identical with their facial expression
D. contrary to their facial expression

[单项选择]

Scientists believe that people "dressed up" long before they made a habit of wearing clothes. Primitive man dressed himself in feathers and ornaments, or painted his body and wrapped himself in animal skins. It was probably some time before man discovered that the decorations kept him warm and protected him from-various injuries. Even today, millions of people who wear little clothing use ornaments and decorations.
When primitive people began to wear clothing regularly, they had to make it from the materials at hand, In cold regions, they often used the skins of fur-bearing animals as protection against the cold. In warmer regions of the world, the people dressed themselves in clothing made from leaves, tree bark and woven grasses. Some people scraped the hair from animal skins to make soft leather for their clothes.
Linen was the first woven material from which clothes were made. From very early times, men have known how to make flax into fine linen. In
A. Sheep can be raised easily and can live in varied climates.
B. Linen was difficult to produce.
C. People liked to wear wool.
D. Fine linen only could be worn by rich people.

[单项选择]Scientists have discovered a close （） between smoking and several serious diseases.
A. action
B. connection
C. union
D. combination

[单项选择]Scientists have discovered in the past few years that ______.


A. the exposure of DNA to the public is unnecessary
B. the tiny cell in DNA is a neat little machine
C. man actually knows nothing about DNA
D. man has much to learn about DNA

[单项选择]To study animal emotions, scientists should
A. set up improved and refined skillful experiments.
B. analyze human emotional.
C. distinguish what is emotional and what is conditioned.
D. learn from animal behaviorists.

[单项选择]Scientists are responsible for people who hold harmful beliefs about human nature because ______.


A. the theories of scientists are used as justification for such harmful beliefs
B. only through science can these people be refuted
C. they have an obligation to correct their mistakes
D. scientists are the ones who know the true nature of humankind

[单项选择]According to scientists, people sneeze because ______.
A. they are ill
B. to sneeze is human nature
C. they do not need any conscious help
D. there are unwanted things in their noses

[单项选择]Scientists, like other people, are always pleased to have their own ideas ______.
A. validating
B. to be validated
C. validated
D. being validated