答案：

　　Part Ⅱ Reading Comprehension (Skimming and Scanning)

　　1. N 2. Y 3. NG 4. N

　　5. some older trees die

　　6. the canopy layer

　　7. kill the host tree

　　8. symbiotic

　　9. insects and birds/insects/birds/animals

　　10. an unknown planet

　　試題解析：

　　Part Ⅱ Reading Comprehension (Skimming and Scanning)

　　1. N 第一段第二句“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”中提到，熱帶雨林占全球面積的6%，卻擁有超過地球一半以上的動植物種類。這句話表明，不是所有動植物物種都能在熱帶雨林中找到，比如很多海洋生物就不能在熱帶雨林中找到。

　　2.根據(jù)“What Is a Rainforest?”部分第三段中的“Since rainforests are at the middle of the globe，located near the equator，they are not especially affected by this change.They receive nearly the same amount of sunlight，and therefore heat，all year.Consequently，the weather in these regions remains fairly constant”，此說法是正確的。

　　3.文中并未提及哪里擁有最多、最大的熱帶雨林，只講到熱帶雨林通常在赤道附近，常年炎熱、降水充分、物種豐富。

　　4.由“What Is a Rainforest?”部分最后一段中的兩句話“As you go lower，down into the rainforest，you find less and less greenery.”和“The overabundance of plants gathering sunlight at the top of the forest blocks most sunlight from reaching the bottom of the forest，making it difficult, for robust plants to thrive.”可見，由于濃密的樹冠層擋住了大部分陽光，地面的植被并不茂盛。所以，題中說法是錯誤的。

　　5.“The Forest for the Trees”部分第一段中的“New tree seedlings rarely survive to make is to the top unless some older trees die，creating a “hole” in the canopy.”因此，答案是“some older trees die”.只有老樹死亡后，新的樹苗才能成活，向上生長，到達(dá)樹冠層。

　　6.“The Forest for the Trees”部分最后一段中提到“Epiphytes are close enough to the top to receive adequate light，and the runoff from the canopy layer provides all the water and nutrients they need，which is important since they don't have access to the nutrients in the ground.”可見為附生植物提供水和養(yǎng)分的是樹冠層。故正確答案為“the canopy layer”。

　　7.由“Strangler and Buttresses”部分的第一段最后一句“Eventually，the strangler may block so much light from above，and absorb such a high percentage of nutrients from the ground below， that the host tree dies.”可見附生植物最終導(dǎo)致宿主樹木死亡。故答案為“kill the host tree”.

　　8.由“Strangler and Buttresses”部分的第三段中的“Rainforest bacteria and trees have a very close，symbiotic relationship.The trees provide the bacteria with fond，in the form of fallen leaves and other material，and the bacteria break this material down into the nutrients that the trees need to survive.”可知樹木為細(xì)菌提供食物，細(xì)菌則分解這些東西，反過來為樹木提供養(yǎng)分.它們之間是密切的共生關(guān)系。故答案為“symbiotic”。

　　9.由“All Creatures，Great and Small”部分第二段“As they travel，the insects may pick up the plants' seeds，dropping them some distance away.”和第三段“This helps to disperse the population of the plant species over a larger area.By the time they excrete the seeds，the birds may have flown many miles away from the fruit-bearing tree，”可見昆蟲和鳥類都能幫助植物傳播種子。雨林中生活的大量動物其實也幫助植物傳播種子。所以，答案可以是“insects and birds/insects/birds/animals”。

　　10.由“Deforestation”部分的最后一段“Destroying the rainforests is comparable to destroying an unknown planet—we have no idea what we're losing.”可知正確答案為“an unknown planet”。