This pair of jeans______ hand, and it______ very comfortable.

A．is make with; is felt

B．are made from; is felt

C．is made by; feels

D．are made of; feels

RNA的主要合成部位是（）

A.高尔基体

B.核糖体

C.粗面内质网

D.核仁组织区

E.滑面内质网