单项选择题

A．source
B．origin
C．course
D．finance
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单项选择题
A．informB．be informedC．to be informedD．informed
A．inform
B．be informed
C．to be informed
D．informed
单项选择题
What can be inferred from the passage
A．Insects are the most adaptable creatures.
B．Insects would be out of control if nothing were done about the current situation.
C．Insects will someday devour all plants on the Earth.
D．Insects have developed resistance to both botanical and artificial poi- sons rapidly.
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