单项选择题

The sign reads "in case of ______ fire，break the glass and push ______ red button"

A．/：a
B．/；the
C．the；the
D．a；a
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单项选择题
The cakes are delicious．He'd like to have ______ third one because ______ second one is rather too small．
A．a；a
B．the；the
C．a；the
D．the；a
单项选择题
While he was investigating ways to improve the telescope Newton made ______ discovery which completely changed ______ man's understanding of color.
A. a ; /
B. a ; the
C. /; the
D. the ; a
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