单项选择题

Disastrous forest fires are quite often caused by simple carelessness: a dropped butt ignites dead leaves（）

A．enflames
B．burns
C．lights
D．blackens

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单项选择题

Export of handicraft products is the mainstay of the county’s economy（）

A. rich resources
B. primary concern
C. only source
D. main support

单项选择题

Next time you have a problem, think about how you can improve the situation instead of ______ all the negative aspects.

A. dwelling on
B. counting on
C. barking on
D. touching on

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