单项选择题

When the heat accumulates in the room, it will become so hot().

A.elects
B. collects
C. selects
D. reflects

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单项选择题

The stain on his shirt is sure not to vanish().

A.disappear
B. appear
C. mix
D. blend

单项选择题

I think they are quite confident in their conclusion.()

A.certain
B. worried
C. suspicious
D. doubtful

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