As we know adults are not ; they do not move comfortably to another place.A. flexibleB.

问题补充：

As we know, adults are not ; they do not move comfortably to another place.

A. flexible

B. reliable

C. intelligent

D. convenient

答案：

(答案→)A. flexible

B. reliable

C. intelligent

D. convenient

解析：A. flexible柔顺的，温顺的，可变通的；灵活的；易适应的，B. reliable 可靠的，C. intelligent聪明的，D. convenient 方便的，句意：正如我们所知,成年人不是很容易适应的;他们不舒服地搬到另一个地方。所以选A。