A:叶绿体
B:线粒体
C:核糖体
D:细胞核
—It's hot today. Have some ________, please.
—No, thanks. I'm not thirsty at all.
用括号内所给词的适当形式填空(5分)
⑴Open the door, please. ____ A.
⑵Close the window, please. ____ B.
⑶Open the window, please. ____ C.
⑷Close the door, please. ____ D.