生态系统中的能量是_________流动的和逐级递减的。
生态系统中的能量是_________流动的和逐级递减的。
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Most people are much less _________of the extent to which work provides the psychological well-being.A． consciousB． freeC． proudD． afraid
Passage OneEvery morning, kids from a local high school are working hard. They are making and selling special coffee at a coffee cafe. They are also making a lot of money.These students can make up to twelve hundred dollars a day. They are selling their special coffee to airplane passengers. After the students get paid, the rest of the money goes to helping a local youth project.These high school students use a space in the Oakland airport. It is usually very crowded. Many people who fly on the planes like to drink the special coffee.One customer thinks that the coffee costs a lot but it is good and worth it. Most customers are pleasant but some are unhappy. They do not like it if the coffee cafe is not open for business.The students earn $ 6.10 an hour plus tips. They also get school credit while they learn how to run a business. Many of the students enjoy the work although it took some time 1o learn how to do it.They have to learn how to steam milk, load the pots, and add flavor. It takes some skill and sometimesmistakes are made. The most common mistake is forgetting to add the coffee.36. Based on the passage, it seems that the purpose of the cafe is to______.A. learn a skillB. help a youth projectC. do businessD. earn school credit
物种频度从高到低分A、B、C、D和E五级，按饶基耶尔频度定律，不正确的是（ ）A．E级越高，群落的均匀性越太B．群落的均匀性与A级和E级的大小成正比C．属于A级频度的种类通常是很多的D．B、C、D级的比例增高，群落中种的分布变均匀
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