The Greens used to live in London and now they         in Beijing.

A．used to live

B．are used to live

C．are used to living

D．are used for living

溶组织内阿米巴生活史的两个时期是指

A．滋养体和包囊
B．组织内滋养体和肠腔内滋养体
C．滋养体和配子体
D．环状体和配子体
E．速殖子和缓殖子