1. They cite evidence that (1) most students choose from among a very narrow group of occupations; (2) as many as 40 to 60 percent choose professional occupations, when in reality only 15 to 18 percent of the work force is engaged in professional work; …(line 7 unit 3)

1) 从属连词that引导四个名词性从句，作名词中心词evidence的同位语从句.
2) from among 介词from可与副词或介词短语搭配, 如：from above, from across, from behind, from below, from inside, from under, from within, from out of等
e.g. A sound comes from behind the door.
3) 该句中的as many as与我们常见的同级比较不同，其在句中起强调作用，意思是“多达”。
e.g. She has as many as seven watchers.
她的手表达7块之多。

2. Of course, complacency is appropriate for any decision in which nothing much is at stake, but that does not describe career decisions. (Line 18 unit 3)
1) In which… 是“介词+which”型的定语从句修饰先行词decision.
e.g. This is the house in which Churchill was born.
The tool with which he is working is called a wrench.
2) at stake 在危险中；成问题
e.g. Thousands of lives will be at stake if emergency aid does not arrive in the city soon.
如果紧急援助不马上运到这城市的话，成千上万的生命将处于危险之中。

3. When confronted with decision and unable to believe they can find an acceptable solution, some people remain calm by resorting to wishful thinking or daydreaming. (line 20 unit 3)
“连词+过去分词” 作状语，主句的主语some people 是confront 这一动作的承受者。从句部分可看作when they are confronted的省略形式。

e.g. This building will look nice when finished.
这幢建筑完成后会很好看。