单项选择题

A．They used bricks and they are too heavy.
B．They used bricks that were too expensive.
C．Steel was in short supply.
D．The benefits of steel were unknown to them.
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单项选择题
A．It’s now taught with the aid of computers.B．It isn’t considered as important today as it was in the past.C．Children today learn it earlier than those did in the past.D．A lot of time is spent teaching it.
A．It’s now taught with the aid of computers.
B．It isn’t considered as important today as it was in the past.
C．Children today learn it earlier than those did in the past.
D．A lot of time is spent teaching it.
单项选择题
A．He can’t find his office key.B．He has misplaced some exams.C．He is unable to speak.D．He doesn’t like his classroom.
A．He can’t find his office key.
B．He has misplaced some exams.
C．He is unable to speak.
D．He doesn’t like his classroom.
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