填空题

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
B．protection
C．stability
D．power
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