单项选择题

23（）

A．collect
B．pile
C．raising
D．increase

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单项选择题
The brain works much more efficiently when（）

A．both sides of the brain are used equally
B．the left side is fully developed
C．scientists work on it
D．the right side is fully developed
单项选择题
What do automakers blame for there being few electric cars now on the road（）

A．The price of gas.
B．The mandate.
C．The conditions of the roads:
D．The batteries.
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