Question

Energy goes from one plant or animal to another. A food chain shows how this energy moves. Each time an animal gets eaten, its energy is passed onto the animal that eats it. The food chain is very important because it keeps the balance of nature. If one part of the food chain disappears, it can affect all the other plants and animals. Any threat to the food chain is a threat to the environment’s biodiversit(生物多樣性). The food chain helps keep animal populations in balance. However, if something happens to increase or decrease one of the links in the food chain, that balance is broken. If one animal becomes endangered, it puts all the animals above it at risk.

Some of the threats are natural, such as wildfires, hurricanes, tornados, floods and so on. But the biggest threats to the food chain come from you and me. These threats include overhunting, overfishing, logging, farming, development, pollution, etc. The food chain is endangered anywhere humans have had an effect on the natural environment.

A recent study shows that the overfishing of large sharks is damaging the food chain along the US Atlantic coast. Canadian and American scientists say sharks are being killed in great numbers for their meat and fins(鰭). Now, not enough sharks are around to eat the cownose(牛鼻) ray. The ray’s population has increased and they have eaten up the shellfish to the point where it has hurt commercial(商業(yè)的) fishing.

Many of us disturb the natural environment in our own backyards. It’s up to us to take care of the environment and try not to disrupt the natural food chain. If we don’t act responsibly, animals will start disappearing.

1.What can we learn from Paragraph 1?

A. The food chain is not easy to be broken.

B. The energy of an animal usually disappears when it dies.

C. Increasing the links will not break the balance of nature.

D. Breaking the food chain is bad for the biodiversity of the environment.

2.The study mentioned in Paragraph 3 proves that .

A. human activities can be a big threat to the food chain

B. we are all responsible for the breaking of the food chain

C. natural disasters are hard to break the food chain

D. hunting large sharks for meat is beneficial

3.We can infer that the writer wrote this passage mainly to .

A. explain what the food chain is

B. tell us something interesting about Nature

C. suggest that we stop eating meat to save animals

D. suggest that we not disrupt the natural food chain

Answer 1

1.D

2.A

3.D

【解析】

試題分析：文章主要講的是食物鏈的重要作用和食物鏈面臨的嚴(yán)重威脅。食物鏈的存在對(duì)維持自然界的生態(tài)平衡有著重要的作用，然而，食物鏈正面臨著很多威脅。一些威脅來自自然界本身，像野火、颶風(fēng)、洪水等。但是，最大的威脅來自人類活動(dòng)。

1.The food chain is very important because it keeps the balance of nature....Any threat to the food chain is a threat to the environment’s biodiversit(生物多樣性).”可知，食物鏈的存在對(duì)維持大自然生態(tài)平衡和生物多樣性有著重要的作用，如果食物鏈遭到破壞，食物鏈上的所有動(dòng)植物都會(huì)受到影響，故選D。

2.The food chain is endangered anywhere humans have had an effect on the natural environment.”可知，人類的過度捕獵、過度捕撈和過度砍伐等行為已經(jīng)給食物鏈帶來了很大的威脅，第三段列舉的是過度捕殺鯊魚的例子，以此來說明人類活動(dòng)對(duì)食物鏈產(chǎn)生的威脅，故選A。

3.It’s up to us to take care of the environment and try not to disrupt the natural food chain. If we don’t act responsibly, animals will start disappearing.”可知，人們應(yīng)該自覺地保護(hù)環(huán)境，不去破壞自然界存在的食物鏈。說明作者寫這篇文章是在建議讀者不要破壞食物鏈的自然平衡，愛護(hù)我們的環(huán)境，故選D。

考點(diǎn)：環(huán)保類短文閱讀