问题补充：
On weekends the Smiths usually drive to the countryside and the fresh air there.
A. take off
B. take up
C. take out
D. take in
答案：
A. take off
B. take up
C. take out
(答案→)D. take in
解析：动词短语辨析。A起飞；脱掉；成功；B占据；从事于；开始做；C取出；扣除；D吸收，呼吸；理解；欺骗；句意：在周末时，Smith一家总是开车去郊外呼吸新鲜空气。根据句意选择D。
