Theoutlineofrooftopsandchimneys________againstthepalesky.
D
A 离开 B 注意、留神 C 提供 D 显眼、突出
People who can ’t _______ between colors are said to be color -blind.
Thefarmingmethodshavebeen________improvedwiththeinventionofthenewmachine.
Sincewehaveafocusedsubject，weshouldnottalk________.