21．(2012·吉林市一模)Eating too much fat can________to heart disease and high blood pressure.
A. devote B. attend
C. contribute D. turn
答案：C 考查动词词义辨析。句意：摄入太多脂肪可能引起心脏病和高血压。contribute to意为“有助于；促进”符合句意；devote...to...“把……贡献给……”；attend to“照顾”；turn to“转向……”。
22．(2012·桂林、防城港一调)The little boy was so careless with his spelling that he often________letters from words.
A.left off B．left behind
C．left out D．let alone
答案：C 考查动词短语。句意：那个小孩拼写如此粗心以至于他经常漏字母。leave out“遗漏，省略”符合句意。
