单项选择题

(Lost in thought), she (didn't hear) the thunder (to begin) in the mountains (far off).

A．Lost in thought
B．didn't hear
C．to begin
D．far off
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单项选择题
The number of tourists from the west (have) (more than doubled) since China (adopted) the open door policy two decades (ago).
A．have
B．more than doubled
C．adopted
D．ago
单项选择题
(Few of the people) in that area realize (the importance of) protecting the environment, (either do they know how) to do (so).
A．Few of the people
B．the importance of
C．either do they know how
D．so
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