To (people) from the northern parts of the country, (tropical) butterflies (may) seem (incredible) big.（）

单项选择题(New uses) for plastics (were found) during (the) 1950’s and 1960’s in medicine, space, research, (industrial), and architecture.（）

A.New uses
B.were found
C.the
D.industrial

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

A.contented
B.hunger
C.frequently
D.sound