题目

用所给词的适当形式填空 1.There(be) some orange juice in the glass.  2.You,he and I(be) in the same class,so we are classmates.  3.It’s three o’clock now.Anna and Lucy(read) in the library.  4.Listen!Who (sing) a popular song in the next room?  5.Grace(like) ball sports.Now she(play) volleyball with her friends.  答案：1.is 2.are 3.are reading 4.is singing 5.likes ; is playing人体的特异性免疫过程，请据图判断下列说法正确的是（ ）A．⑤⑥两种免疫依次表示体液免疫和细胞免疫B．能特异性识别抗原的细胞有a、b、c、d、fC．HIV侵入人体对⑤⑥尤其是⑤有破坏作用D．细胞e→细胞d→③作用的过程发生在机体首次接触抗原时