times say that people who are nervous have ants (蚂蚁) in their pants."可知，当一个人很紧张时，我们可以用"Have ants in one's pants."来表述。故选B项。

　　2．If we say someone has to tighten his belt, we probably mean he ________.

　　A．has done something wrong

　　B．used to live a rich life

　　C．has put on the wrong pants

　　D．is short of money

　　答案与解析：D　细节理解题。根据文章第三段的最后一句"If you have less money than usual, you may have to tighten your belt."可知，"... someone has to tighten his belt..."主要用来描述一个人钱不够花、很拮据的情景。故选D项。

　　3．Someone who spends his money at the drop of a hat most probably ________.

　　A．doesn't save money

　　B．earns much money

　　C．never wastes his money

　　D．spends more than he earns

　　答案与解析：A　细节理解题。根据文章第四段中"Yet, when it comes to my own money, I spend it at the drop of a hat, which means I instantly spend it."可知，"Someone who spends his money at the drop of a hat..."意味着一个人花钱大手大脚，不节省。故选A项。

　　4．We can use the expression "wear one's heart on one's sleeve" to describe someone who ________.

　　A．gets angry easily

　　B．looks very serious

　　C．shows his feelings openly

　　D．often wears a suit and tie

　　答案与解析：C　细节理解题。根据文章最后一段中"Some people who do not know him well think he is too serious and never shows his feelings openly. But I know that my father wears his heart on his sleeve."可知，"wear one's heart on one's sleeve"用来指一个人敞开胸怀表达自己的情感。故选C项。