1．Many people agree ________ knowledge of English is a must in ______ international trade today.
A．a ; × B．the ; an C．the ; the D．× ; the
解析：
knowledge是抽象名词，本题中的knowledge不是泛指意义，而是将其具体化，表示“对……有某种程度的了解。”如a knowledge of London , a knowledge of Chinese history 等，故须加不定冠词。后一空格中的international trade表示一般概念，trade是不可数名词，故不用冠词。
答案：A
2．My ______ of this weekend’s activity is going out with some good friends.
A．idea B．opinion C．mind D．thought
解析：
名词辨析。idea意为“构想，主意，想法”，opinion 意为“意见，看法”，mind意为“感知，思维，心智”，thought意为“想法”。此句应为我这个周末活动的“设想”。
答案：A
3．I was on the highway when this car went past followed by a police car. They ____ at least 150 kilometers an hour.
A．should have been doing B．must have been doing
C．could have done D．would have done
解析：
该题表达对过去事情的一种肯定推测，故用must have done的形式，句意为“那辆车/他们准是正以每小时至少150英里的速度行驶着。”
答案：B
