单项选择题

How many people could not have a sound sleep at night according to the recent survey

A．70%.
B．54.3%.
C．45.3%.
D．36.5%.
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单项选择题
Babies sleep much longer than adults each day because ______.
A．they have nothing else to do day and night
B．they need sleep to help develop brains and bodies
C．adults find it difficult to fall asleep at night
D．adults have quite a lot of things to do during the day
单项选择题
Why could maglev trains replace short-flight commuter aircraft
A．Maglev trains are faster.
B．Maglev trains are cheaper.
C．Maglev trains are more fuel-efficient.
D．Maglev trains are safer.
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