C. Choose the words or expressions to complete the passage (選擇最恰當(dāng)?shù)膯卧~或詞語完成短文)

We have always been warned of the dangers of forest fires. They cause _____ 15 _____ to a forest. They kill many plants and animals in an eco-system, which is a group of living things and their environment. But have you ever heard of a forest fire that can be _____16_____ for a forest? People start some of the fires with a special reason to actually do good to the eco-system.

In fact, fires are a natural part of any eco-system. Without fires, the oldest and largest trees would stop sunlight from reaching the forest floor. Fires can _____17_____ some of these old trees. When the trees die, they provide something good for the earth. New trees can grow strong and healthy in their place.

Some trees even need fires to grow. These trees hold their seeds (種子) inside. Heat from a fire allows the coat of the seeds to open up. Then the seeds fall to the ground and have the _____18____ to grow/

Scientist, who know about nature’s needs, start some of these fires, called controlled burns. A fire is started and kept under control. This way, the fire does not spread out of the area or _____19_____ a after forest fires, they can go hungry _____20_____ their food has been damaged in the fire. Small, controlled fires mean than animals will not have to move far to find food. After some time, small plants begin to grow. Animals return soon after the plants return. This _____21_____ makes an eco-system.

So the next time you hear about a forest fire, think about the good as well as the bad. It may take a new eco-system a while to return, but it will likely come back stronger and healthier than ever.

15. A) illness B) difficulty C) damage D) flood

16. A) helpful B) powerful C) harmful D) awful

17. A) take the place of B) get ready for C) be bad for D) get rid of

18. A) time B) water C) chance D) skill

19. A) discover B) cover C) but D) waste

20. A) because B) although C) but D) so

21. A) almost B) again C) never D) even

【主旨大意】

文章指出森林火災(zāi)并不像人們想象的那樣一無是處，有時(shí)候，可控范圍內(nèi)的火災(zāi)不僅無害而且還具有積極意義。比如，可控制的火災(zāi)可以使森林里的老樹、死樹燒掉，使陽光能夠照射到地面；火災(zāi)燒掉了一些種子外層包裹的厚厚的皮，并讓種子有機(jī)會得以在地面上生根發(fā)芽。

15. C 【解析】該句意為“森林火災(zāi)會對森林引起毀壞”，damage名詞，意為“毀壞、損害”，flood名詞，意為“洪水”；illness意為“疾病”選項(xiàng)C意為“困難”，故由句意答案選C；

16. A 【解析】由后邊的那句話可以知道“有時(shí)候森林火災(zāi)對森林系統(tǒng)還是有幫助的”，故答案選A；

17. D 【解析】該句意為“森林火災(zāi)可以燒掉一些老樹”，get rid of意為“去掉，除去”，故選D；而選項(xiàng)A為“取代，代替……”，選項(xiàng)B是“為……做好準(zhǔn)備”，選項(xiàng)C為“對……有害處”，A、B、C均不符合題意；

18. C 【解析】此處是指經(jīng)過火燒之后，有些種子厚厚的包衣被燒掉了，并掉到了地上，他們才有了生根發(fā)芽的機(jī)會?！惫蔬xC；A、B、D均不符合漢語意思；

19. B 【解析】句意為“通過這種方式，森林火災(zāi)不會傳播到別的地區(qū)或者燃燒一大片森林?！眂over本意為“涉及，覆蓋”，此處是指不會造成大面積的森林被燒掉；選項(xiàng)A意為“揭露，發(fā)現(xiàn)”，選項(xiàng)D為“浪費(fèi)”，都不符合題意；

20. C 【解析】此處是指森林大火過后，即使動(dòng)物能夠生存，他們也要經(jīng)歷饑餓的折磨，“因?yàn)樯种械氖澄锉淮蠡鹌茐牧恕保蚀鸢高xC；

21. B 【解析】此處講一段時(shí)間之后，小的植物開始生長。動(dòng)物在植物生長之后也重新回來了?！斑@又形成了一個(gè)(新的)食物鏈”，故答案選again，選項(xiàng)A、C、D均不符合句意；