Would you like to _________ this song?[ ]
A. sing
B. play
C. listen
D. look
答案:A
— __________ would you like to drink, Danny?
— Some pop, please.[ ]
A. Where
B. What
C. When
D. How
具有非特异免疫的组织屏障不包括
A.汗腺分泌物
B.正常菌群
C.血脑屏障
D.脾脏
E.胎盘屏障