关于合理饮食有利于健康的下列说法正确的是（ ） A．没有水就没有生命 B．饮用水

Don’t you think that______________ is no use promising without doing?

A．this

B．that

C．it

D．what

—Would you like some more rice?       

—No, thank you. I'm _____.   [ ]

A. hungry   

B. full   

C. thirsty  

D. sleepy

下列符号中，表示两个氢分子的是

A．H₂

B．2H

C．2H⁺

D．2H₂

Which of the following statements is true in the Grammar-Translation Method

A．L1 was maintained as the reference system in the acquisition of L2.

B．L2 was maintained as the reference system in the acquisition of L1.

C．Latin was maintained as the reference system in the acquisition of L2.

D．Latin was maintained as the reference system in the acquisition of L1.

简述普通股和优先股各自筹资的特点。