听力原文:W: Gosh! Kevin, are you OK? Another cup of coffee?
M: Yeah, I stayed up all night cramming for my poetry exam. I couldn't keep my eyes open in my last class. I'm having this coffee so I can stay awake this afternoon.
W: Haven't you ever heard that drinking too much coffee is harmful to your health?
M: It's a little odd. What do you mean harmful?
W: Well, for one thing it may cause heart disease.
M: Most of the research about the link between coffee and heart disease is inconclusive.
W: But coffee has caffeine that is addictive, once addicted, it's hard to kick it off.
M: Not so horrible. You can't become addicted to caffeine like other drugs.
W: Yes, you can. Don't you know that people who are deprived of caffeine suffer with draw symptoms, especially headache?
M: Oddly enough, one cure for headache is caffeine. Besides, coffee helps me work faster?
W: Studies have showed that coffee makes you work faster but not necessarily better. You may finish your exam in a shorter period but you won't have fewer errors.
M: You know, soda in your drink has caffeine too.
W: But 12 ounces of soda has haft the caffeine of a 5 ounces cup of coffee. And a cup of tea has less than that.
M: But I cannot resist the taste of coffee.
W: You could drink decal Decaffeinated coffee doesn't have as much flavor or body as regular coffee.
What is the conversation mainly about?
A.How to do well on poetry examination.
B.The effect of caffeine.
C.Some causes of heart disease.
D.Problems with the man's cafeteria.
第3题
A、自然环境是由人类赖以生存的自然条件所构成
B、自然环境是由人类赖以生存的物质条件所构成
C、自然环境是由人类赖以生存的自然资源总括所构成
D、自然环境是由对人类有益的自然资源所构成
E、自然环境是由人类所改变的自然资源所构成
第4题
A.自然环境包括人类生活的一定的生态环境、生物环境和地下资源环境
B.自然环境不等于自然界,只是自然界的一个特殊部分
C.自然环境是指那些直接影响人类社会的自然条件
D.生态环境并不等同于自然环境,只有具有一定生态关系构成的系统整体才能称为生态环境
第5题
下列选项对自然环境描述不正确的一项是()。
A.自然环境包括人类生活的一定的生态环境、生物环境和地下资源环境
B.自然环境不等于自然界,只是自然界的一个特殊部分
C.自然环境是指那些直接影响人类社会的自然条件
D.生态环境并不等同于自然环境,只有具有一定生态关系构成的系统整体才能称为生态环境
第6题
A.自然环境包括人类生活的一定的生态环境、生物环境和地下资源环境
B.自然环境不等于自然界,只是自然界的一个特殊部分
C.自然环境是指那些直接影响人类社会的自然条件
D.生态环境并不等同于自然环境,只有具有一定生态关系构成的系统整体才能称为生态环境
第7题
第9题
人类赖以生存的自然环境包括地球上的
A.气圈、水圈、土壤圈、食物圈
B.气圈、水圈、土壤圈、生物圈
C.气圈、水圈、土壤圈、食物链
D.气圈、水圈、岩石圈、生物圈
E.气圈、土壤圈、岩石圈、食物圈
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