It is very convenient to pay by（）card.

单项选择题His wife is a（n）（）housekeeper.

A.corresponding
B.thrifty
C.economic
D.respective

单项选择题The fields were（）every year by the run-off water from the mountains.

A.fertilized
B.dropped
C.digested
D.starved

单项选择题The picture（）the seriousness of pollution on our planet.

A.derails
B.depresses
C.depicts
D.derives

单项选择题The heat in the（）air rising from the kitchen and bathroom is recovered by the pumps.

A.dank
B.moist
C.drought
D.digestive

单项选择题More （）intelligence companies will start to emerge to meet this challenge.

A.fake
B.synthetic
C.reserved
D.artificial