单项选择题

This popular sports car is now being ______ at the rate of a thousands per week.

A．turned down
B．turned out
C．turned up
D．turned on
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单项选择题
The passage suggests that scientists might not have developed the theory of cell-mediated immunological reactions if______.
A．proteins existed in specific group types
B．proteins could have been shown to direct the synthesis of other proteins
C．antigens were always destroyed by proteins
D．antibodies were composed only of protein
单项选择题
Which of the following titles best describes the content of the passage
A．The Origins and Effects of Supernovas.
B．The Life and Death of Stars.
C．The Origins and Evolution of Life on the Earth.
D．The Aftermath of a Supernov
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