[单项选择]Passage Six
Rainforests

Tropical rainforests are the most diverse ecosystem on Earth, and also the oldest. Today, tropical rainforests cover only 6 percent of the Earth’s ground surface, but they are home to over half of the planet’s plant and animal species. In this completely unique world, there are thousands of species we have yet to discover.
In this article, we’ll travel into the tropical rainforest to see what makes it such a beautiful environment for plants and animals. We’ll also see why the rainforests are in danger and look at some of the ways this affects us.
What Is a Rainforest
Generally speaking, a rainforest is an environment that receives high rainfall and is dominated by tall trees. A wide range of ecosystems fall into this category, of course, including the old-growth temperate forests of the Pacific Northwest. But most of the time when people talk about rainforests, they m
A. we are familiar with them
B. no more species of rainforests need to be discovered
C. most species will not survive without tropical rainforests on Earth
D. tropical rainforests are the oldest and the most diverse ecosystem

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[单项选择]Passage Six
Rainforests

Tropical rainforests are the most diverse ecosystem on Earth, and also the oldest. Today, tropical rainforests cover only 6 percent of the Earth’s ground surface, but they are home to over half of the planet’s plant and animal species. In this completely unique world, there are thousands of species we have yet to discover.
In this article, we’ll travel into the tropical rainforest to see what makes it such a beautiful environment for plants and animals. We’ll also see why the rainforests are in danger and look at some of the ways this affects us.
What Is a Rainforest
Generally speaking, a rainforest is an environment that receives high rainfall and is dominated by tall trees. A wide range of ecosystems fall into this category, of course, including the old-growth temperate forests of the Pacific Northwest. But most of the time when people talk about rainforests, they m
A. with a high capacity of species and has distinct seasons
B. which does not include the old-growth temperate forests
C. receiving little rainfall since located in the tropics
D. featured by tall trees with high rainfall

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[单项选择]Passage Six

Participant observation also reflects anthropology’s dual nature as both a scientific and a humanistic discipline. Through the stress on participation and getting the insider’s view, anthropologists of necessity become personally involved with their subjects. They show a humanistic concern for the people they study, and through their attempts to understand and describe people’s behavior they help give outsiders a rich appreciation for other people and other ways. Nevertheless, with its stress on observation, anthropologists strive to fulfill the requirements of a scientific discipline. Anthropologists strive for objectivity and accuracy. They often actually count, for example, the number of times specific behavior patterns occur and under what circumstances they use this data for empirical studies that integrate their observations i
A. explain what anthropology is concerned with
B. compare two different schools of anthropology
C. show people how anthropologists do their studies
D. distinguish anthropology from other disciplines

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[单项选择]Passage Six

Caffeinated coffee may have an undeserved bad rap. A new study shows the decaffeinated variety may have harmful heart effects. The study showed that people who drank decaf had higher levels of a protein linked to heart disease risk compared with those who drank caffeinated coffee or no coffee. "But the differences were fairly small and there’s probably no health threat from drinking a cup or two of any type of coffee a day," says researcher H. Robert Superko, MD. The research is the latest entry into a long line of scientific studies looking at whether coffee drinking can lead to heart disease.
The participants were given premeasured bags of coffee to make in their coffee machines provided by researchers, They agreed to drink it black--no cream or sugar al-lowed. And they agreed to periodic blood tests so the researchers could k
A. posing an example
B. justifying an assumption
C. making a comparison
D. explaining a phenomenon

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