单项选择题

We learn from the passage that ______.

A．the bacteria are only effective against three species of beetles
B．Fields' technique is less effective in winter
C．Fields' technique may kill nearly all the beetles at -10℃
D．Insects may develop resistance against the bacteria
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单项选择题
Before the 17th century, the little people or the hidden people were ______.
A．highly respected
B．called universally as fairies
C．believed to be active at night
D．said to move about naked all the time
单项选择题
According to the passage, the little people would do all of the following EXCEPT ______.
A．steal human babies
B．steal fruit
C．kill farm animals
D．milk cows
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