When (contented), and occasionally when (hunger), cats (frequently) make a strange (sound).（）

单项选择题The (massive) architecture of the ancient Egyptians (was advanced) than (that of) the Sumerians (苏美尔人) and even surpassed that of (later) societies.（）

A.massive
B.was advanced
C.that of
D.later

单项选择题On the one hand, the turkey vulture(秃鹫) (disgusts people) because of (its) eating habits. (On the contrary), it fills a useful role by (consuming) the flesh of dead animals.（）

A.disgusts people
B.its
C.On the contrary
D.consuming