抗体
参考答案:
由B淋巴细胞产生的蛋白质(免疫球蛋白质),它能识别特殊的外源“抗原”,从而引起免疫应答。
Mr. Smith is an Englishman. He teaches English well. His English classes are very interesting. He likes us and we like him, too.
Mr Smith has two children—Tom and Lucy. Tom is seven and his sister Lucy is four. Tom goes to school but Lucy doesn’t. Mr Smith likes to wear(穿 )a T-shirt and jeans(牛仔裤).Football is his favourite sport. After school we often have a basketball match. Sometimes(有时) Mr Smith watches and joins us. He plays basketball just for fun.
小题1:Mr Smith is __________.
A.a Chinese teacher
B.an English driver
C.a Japanese teacher
D.an English teacher小题2:How many sons does Mr Smith have?
A.Only one
B.Two
C.Three
D.Not any小题3:Lucy doesn’t go to school because ___________ .
A.she looks beautiful
B.she is seven
C.she is only four
D.she doesn’t like school小题4:________ is Mr Smith’s favourite sport.
A.Basketball
B.Football
C.Running
D.Volleyball小题5:The story is about _________.
A.Mr Smith’s son
B.Mr Smith
C.Tom and Mary
D.a basketball match
统计机构应当依法履行职权,不能超越职权、滥用职权,但可以放弃职权。