原型化方法的使用有一定的局限性，主要表现在A．原型化方法的使用和推广必须要有合适的工

Some shops ______ 8:00 a.m. and 8:00 p.m. in my hometown. [ ]

A. are open from

B. are open at

C. open from

D. open between

天冬的主要性味是（）。

A.甘苦寒

B.甘辛温

C.苦酸凉

D.甘辛寒

E.甘咸温

___________she was invited to the ball made her very happy.

A．If

B．That

C．When

D．Because

— How long will it be _______ the president pays another visit to China?

— It all depends.

A．before

B．until

C．since

D．when

对排查出的事故隐患，经分析评价确认为一般事故隐患的，水利水电施工企业也要为其登记建档。