单项选择题

The fifth generation computers, with artificial intelligence, ______ and perfected now.

A．developed
B．have developed
C．are being developed
D．will have been developed
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单项选择题
What happened during the past four weeks
A．The man has bought a new house.
B．The man’s company has moved to a new building.
C．The man’s family has moved to a new building.
D．Nothing special.
单项选择题
What is the purpose of a canal lock
A．To keep out boats that are too large for the canal.
B．To measure the tonnage of canal boats.
C．To load and unload the cargo.
D．To change the depth of the water.
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