Question

Animals are considered to be endangered if the species is close to extinction throughout all or most of its environment. Animals become endangered for a variety of reasons.
Some animals become endangered when their habitats contain resources for humans. For example, commercial forest cutting in the Amazon Rainforest has seriously reduced the population of many animal species and lead to the extinction of other groups. Land itself is an important resource to humans since it provides us with living space, and when people replace animal habitats with human habitats, it can lead to larger loss of natural species.
Commercial and industrial operations may reduce land or water for animals and pollute their environment. Due to water pollution, the baiji, a fresh water dolphin native to China, was declared extinct, meaning it’s unlikely the population can recover. Even noise pollution from human activities can lead to the disorder of animal behavior.
Another cause that makes animals become endangered is over-fishing or over-hunting. Over-hunting whales led to near extinction of many species of whales.
The introduction of a non-native species to a habitat may make animals become endangered. The native species may not defend against a new one, and the effects can be dangerous. In Australia, the introduction of the common house cat led to the extinction of the red-fronted parakeet and has seriously damaged the populations of several small animals.
Introduced species can also bring new diseases with them. As a result, animals become endangered. Native animals may not have the power to fight against non-native diseases, and population levels can suffer. Another cause of disease is human-introduced chemicals. The use of DDT is believed to be one of the leading causes in driving the California Condor to near extinction.
When animals become endangered, the entire food chain can be affected. For example, in 2008 disease seriously harmed the honeybee, which is largely responsible for pollinating(授花粉)  plants, including many fruits and vegetables. Without their pollination, a very large part of the human diet could be reduced. In fact, if the honeybee should become extinct, our life would be affected and billions of dollars would be lost. Therefore, many people argue that when animals become endangered it is in man’s own self-interest to protect them.
小题1:The passage is mainly about ______.

A．ways of protecting animals’ habitats

B．effects caused by species endangerment

C．dangers of bringing in non-native species

D．reasons why animals become endangered

小题2:Which of the following examples shows that environmental pollution may cause species endangerment?

A．The extinction of the whales.

B．The extinction of the red-fronted parakeet.

C．The decreasing population of the dolphin.

D．The effect of the honeybee on the human diet.

小题3:Why is it dangerous to introduce a non-native species to a habitat?

A．Native species are likely to die from the new diseases.

B．It’s hard for non-native species to survive.

C．Non-native species will take up more space.

D．Native species are so powerful for non-native species.

小题4:The California Condor is in danger of dying out because of ______.

A．loss of habitat	B．harmful chemicals
C．forest cutting	D．unfamiliar diseases

小题5:We can infer from the last paragraph that ______.

A．humans are to blame for species extinction

B．small animals mean little to the whole food chain

C．protection of the honeybee has cost billions of dollars

D．humans protect animals for the benefit of themselves

Answer 1

小题1:D
小题2:C
小题3:A
小题4:B
小题5:D

试题分析：现在很多动物濒临灭绝，文章通过举例说明动物灭绝的种种原因，有可能是环境污染，也有可能是引进外来的物种，还有化学物质的使用，人类应该负起责任保护这些动物。
小题1:主旨题：从文章第一段的句子：Animals are considered to be endangered if the species is close to extinction throughout all or most of its environment. Animals become endangered for a variety of reasons.可知这篇文章讲的是动物灭绝的原因。选D
小题2:细节题：从三段的句子：Commercial and industrial operations may reduce land or water for animals and pollute their environment. Due to water pollution, the baiji, a fresh water dolphin native to China, was declared extinct, meaning it’s unlikely the population can recover.可知用海豚数量减少的例子说明环境污染会导致物种的灭绝，选C
小题3:细节题：从第五段的句子：The introduction of a non-native species to a habitat may make animals become endangered. The native species may not defend against a new one, and the effects can be dangerous.可知引进非本地的物种对当地的物种是危险的因为当地的物种可能死于新的疾病，选A
小题4:细节题：从第六段的句子：Another cause of disease is human-introduced chemicals. The use of DDT is believed to be one of the leading causes in driving the California Condor to near extinction.可知The California Condor濒临灭绝主要是因为有害的化学物质，选 B
小题5:推理题：从最后一段的句子：Therefore, many people argue that when animals become endangered it is in man’s own self-interest to protect them.可知人类应该为物种的灭绝负责。选D