构成人体的四种基本组织是（ ） ①保护组织②上皮组织③机械组织④肌肉组织⑤神经组

It is essential__________(文件在这个周末前递交)．

— How about the price of these computers ?

— They are equal in price to, if not cheaper than, ________ at the other stores．

A．others

B．it

C．that

D．the ones

数据1，x，2，5的中位数是3，则x=______．

It was lucky for him to be admitted _______the university he had longed for.

A．as

B．with

C．for

D．to

卢浮宫