唐朝文化繁荣的根本原因是[ ]
A．人口众多
B．历史悠久
C．经济发达
D．疆域辽阔
答案：C
So far it has been suggested that special stress _____ on pre-school education.
A．is laid
B．be laid
C．has been laid
D．have been laid
They hurried to the train station, it was too late. They had to wait another ten minutes.
A．but
B．so
C．and
D．or
