单项选择题
According to the passage, it is believed that the sun （） .
A．moves in a quick but steady way year after year B．sends out less and less heat and light with each passing year C．radiates the same amount of light every year D．might have a strong influence on the weather patterns
单项选择题 21（）
单项选择题 The writer is in favor of the view that man’s intelligence is given to him （） .
单项选择题 Which of the following statements is true about the students in the Middle Ages（）
