Living habits make a person healthy, wealthy and wise. We should        in daily life.

① put litter into the dustbin

② stay up reviewing lessons all the time

③ go to school without breakfast

④ wash hands before meals

⑤ open the window and take a fresh breath as often as possible

A. ①④⑤             B. ②③④               C. ①②⑤

压缩式制冷循环经过四个过程，它们依次是（）。

A.压缩、节流、蒸发、冷凝

B.冷凝、压缩、蒸发、节流

C.蒸发、减压、节流、冷凝

D.压缩、冷凝、节流、蒸发