阿米巴痢疾的传染源主要为()
A.携带包囊的苍蝇
B.携带包囊的蟑螂
C.曾患阿米巴痢疾但已痊愈者
D.包囊污染的食物与水
E.粪便持续排包囊的带虫者
参考答案:E
--- How long has your brother the computer?
--- About two weeks.
A.bought
B.had
C.received
D.borrowed
中国第一大瀑布是______瀑布。