英语求救啊!Jim walked into the lobby of the large office building

英语求救啊!
Jim walked into the lobby of the large office building.It was the first time he had ever visited his girl friend at work,and he was looking forward to seeing her office and meeting her co-workers(同事).He decided he would use the bathroom before trying to locate her office.As he was looking around the lobby(大厅)for the men’s room he spotted the security guard(保安),a man in his fifties who was clearly of Latin American descent(拉丁美洲血统).The guard was busy fixing something on his desk when Jim interrupted.
“Excuse me,do you know where the man’s room is?”
Without nodding or stopping his work,the guard pursed his lips(噘起嘴).Seeing the guard’s response,Jim wondered to himself,“What’s the matter with this guy?How can he work here and not know where the bathroom is?”
The security guard looked at Jim,who continued to stand there,a puzzled expression(表情) on his face.The guard thought to himself,“What’s the matter with this guy?He asks me for directions,and when I show him he just stands there.Maybe he’s up to no good.”
Jim frowned(皱眉)and asked impatiently,“Do you speak English?”
The guard answered,angry at having been asked such a question,“of course I speak English.I wouldn’t have the job if I didn’t speak English.”
“Then can you tell me where the bathroom is?” Jim asked.
“Down the hall,” the guard replied.
As Jim walked down the hall he shook his head and thought to himself,“Why didn’t he help me in the first place.”
16.The word “spotted” in the first paragraph most probably means _______.
a.marked b.caught c.watched d.saw
17.When the guard was asked if he knew where the bathroom was,he ____.
a.refused to answer the question
b.wondered what was the matter with the guy
c.got angry at being interrupted
d.indicated its direction by using his lips
18.Seeing Jim still standing there,the guard suspected _______.
a.he was a fool
b.he misunderstood his response
c.he was planning to do something bad
d.he had not heard his answer
19.Jim stood there because he was waiting for ___________.
a.an opportunity to carry out his plan
b.his girl friend to come out of her office
c.an answer to another question
d.a clearer response of his question
20.The theme of the story is __________.
a.generation gap may give rise to conflicts
b.impossible accidents do occur sometimes
c.guards working in large buildings are not very helpful
d.differences in culture can lead to misunderstanding

16.D
spot有看见的意思
17.D
文中说了他撅嘴指方向
18.C
文中be up to no good
意思是不怀好意
显然选C
19.D
根据文意,JIM开始很疑惑,他希望得到明确的指示
20.D
排除法：
a,代沟可能引起冲突?
b,不可能的意外事件的确有时会发生
c,大建筑里面的保安没啥帮助
很明显,这三个选项都不是文章的主题
虽然D也不是最好的,只是一种可能.但其它三个是绝对错的.