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单项选择题


What is the government laboratory trying to do

A．Collect ash tree seeds for experiment.
B．Preserve the healthy ash tree seeds.
C．Set up a new seed bank for research.
D．Develop a new breed of ash tree.
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单项选择题When Brickland and her sister were little, they kept the home key because ______.

A．they wanted to be trusted
B．their mother had to work
C．their mother didn’t live at home
D．they were very naughty and wild

单项选择题What is the disadvantage of the Routemaster

A．It is inconvenient to take the baggage onto it.
B．It is difficult to spare the room for wheelchairs.
C．It is dangerous to get in from both sides of it.
D．It is easy to have an accident on a movable platform.