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What is a Greenhouse Effect

【参考答案】

Insulators prevent heat from being radiated into space.
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单项选择题Many doctors believe that the bypass operation______.

A．is a better way of prolonging one’s life
B．is the only solution to the blockage of one artery
C．should be used to prevent advanced diseases
D．has no effect at all on serious patients

单项选择题A．weightB．protectionC．stabilityD．power

A．weight
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单项选择题What does the speaker think future advertisers should do

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单项选择题According to the author, we should reverse our classification of the physical sciences as hard and the social sciences as soft because______.

A．a reverse ordering will help promote the development of the physical sciences
B．our knowledge of physical systems is more reliable than that of social systems
C．our understanding of the social system is approximately correct
D．we can investigate social phenomena better than physical phenomena

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A．Fashion design.
B．Chemistry.
C．Business.
D．Art appreciation.