单项选择题

A．Because Tom wasn’’t at home.
B．Because the man didn’’t get the right telephone number.
C．Because Tom was too busy to come.
D．Because there was something wrong with Tom’’s phone.
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单项选择题
Learning to use a computer is getting easier all the time because ________.
A．programs are becoming less complicated
B．programs are designed to be convenient to users
C．programming is becoming easier and easier
D．programs are becoming readily available to computer users
单项选择题
We must derive hydrogen from renewable sources with a view to a pure hydrogen economy.
A．Y
B．N
C．NG
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