单选题 Questions 22 to 25 are based on the conversation you have just heard.
单选题 A. She makes the keypad dirty.
B. She always drops crumbs off the computer keyboard.
C. She always eats off a toilet seat.
D. It is not clean.
【正确答案】 D
【答案解析】[解析] 22-25
M: Hi, Jenny, why are you still eating while you are using the computer?
W: Why? I don't make the key- pad dirty.
M: Think twice before eating those dropped crumbs off your computer keyboard — you might as well be eating off a toilet seat.
W: That's horrible; I don't believe that at all.
M: A study by British Consumer magazine who asked a microbiologist to examine for bugs on 33 keyboards in a typical London office, a toilet seat and a toilet door handle.
W: What's the result? Is it serious?
M: Yes, four keyboards were judged potential health hazards and the microbiologist recommended the removal of one keyboard as it had five times bacteria than the cleaned toilet seat.
W: Most people don't give much thought to the dust and dirt that builds up on their PC.
M: But if you don't clean your computer, you might as well eat your lunch off the toilet.
W: In that way, poor personal hygiene, such as not washing hands after going to the toilet, may also add to the dirtiness of the keyboards.
M: But as far as I know, a survey of 4,000 people by the magazine found one in ten people never cleaned their keyboards while another two in ten never cleaned their mouse.
W: Oh, I should first clean my hands and learn how to clear out bugs.

22．Why is the woman advised not to eat at the computer?

[解析] 细节题。对话表明，边使用键盘边吃东西就好像在马桶边上吃饭一样不卫生，故选D。
单选题 A. There are many difficulties in the examination.
B. The examination is useless for the employees.
C. The examination is to tell people there are many bugs on keyboard.
D. The examination is very successful.
【正确答案】 C
【答案解析】[解析]
What ca we know about the microbiologist's examination?

[解析] 细节题。英国《消费者》杂志邀请一名微生物专家检测一家典型的英国办公室里的33个键盘，一个厕所马桶和厕所门把手的细菌状况。检测目的是为了让人们了解键盘上的细菌非常多。
单选题 A. Wash hands after going to the toilet. B. Eat at the computer desks.
C. Eat much at lunch. D. Touch the toilet door handle.
【正确答案】 B
【答案解析】[解析]
Which is the cause of a bug-infected keyboard?

[解析] 细节题。根据对话，在键盘旁边吃东西是造成键盘细菌感染的最主要原因，其次卫生状况差，像如厕后不洗手也会加重键盘细菌的滋生程度，A项正好与对话内容相反。故选B。
单选题 A. The survey needs more than 4,000 people.
B. A minority of people never clean the keypad and the mouse.
C. 10 people never clean their keypad and mouse.
D. People never clean the keypad and mouse.
【正确答案】 B
【答案解析】[解析]
What can be inferred from the conversation?

[解析] 推理题。根据对话，该杂志社所做的4000人的调查中，每10人就有一人从不清洁键盘，还有两人从不清洁鼠标，因此少部分人从不清洁键盘和鼠标。A minority of people“一少部分人”。