21．Happiness and success often come to those________are good at recognizing their own strengths.
A．whom B．who C．what D．which
21. B。考查定语从句。who指代先行词those（那些人），在从句中做主语， whom不能做主语，which指物，what不能引导定语从句，故选择B。
解题技巧：找主干，析从句。1.找主干：因为主句完整， Happiness and success often come to those.不难看出本题考查定语从句，排除what。2.析从句:____are good at recognizing their own strengths,缺主语，先排除whom，先行词those（那些人），排除which，故选择who。
【句意】幸福和成功总青睐能善于意识到自己长处的人们。
22．“What do you want to be？” asked Mrs. Crawford. “Oh，I________ president，” said the boy, with a smile.
A．have been B．am C．was D．will be
22. D。考查动词时态。从题干want可判断出本题考查一般将来时。解题技巧：要善于在语境明确时态，如;want, intend, plan, mean, expect等表示计划打算的动词，隐含着将来意义。
【句意】“你长大了想干什么？”Crawford先生问道，男孩笑着说：“我想当总统。”
