7．Green invaders （侵略者） are taking over America．No，not invaders from space．Plants．You might not think of plants as dangerous，but in this case they are threatening nature's delicate food web．
The invaders are plants from other countries brought here to make gardens and yards look pretty．Ever since people started to arrive on America's shores，they've carried along trees，flowers，and vegetables from other places．Now there are so many of those plants，they are crowding out the native plants that have lived here since before human settlers arrived．
And that's a problem，says Dr Doug Tallamy．He's an entomologist （an insect expert）at the University of Delaware．He explains that almost all the plant-eating insects in the United States-90% of them-are specialized．That means they eat only certain plants．Monarch butterfly caterpillars （毛毛虫），for example，feed on milkweed．If people cut down milkweed and replace it with another plant，the butterflies will not have the food source that they need to survive．
But the trouble doesn't stop there，it goes right across the food web．When insects can?t get the right plants to eat and they die off，then the birds don't have enough bugs for their meals．Tallamy points out that almost all migrating birds depend on insects to feed their young．"We cannot let the plants and animals around us disappear，"says Tallamy．"The way to preserve them is to give them food to eat．But when we plant non-native plants，we are clobbering the food web，because then we don't have the insects the birds need to live．"
Fewer of the right plants mean fewer bugs，and fewer bugs mean fewer birds．And that's bad for the Earth，because we need a variety of living things to keep the planet healthy and beautiful．The good news is，gardeners everywhere are working hard to protect native plants and get rid of the invaders．Many local garden centers sell native plants．Planting the right things makes a real difference，and fast．
60．What's the best title for the passage？B
A．Plant Native Plants
B．Green Invaders
C．Invaders from Space
D．Monarch Butterfly Caterpillars
61．We can infer from the passage that milkweed is a kind of．A
A．plant B．animal C．insect D．fish
62．Which of the following statements is NOT true？C
A．Green invaders are mainly brought in by human beings．
B．Monarch butterfly caterpillars only feed on milkweed．
C．No measures are taken to plant more native plants．
D．Food web in nature can be easily damaged．
63．Which of the following shows the CORRECT order in which food web is destroyed？C
a．some insects will lose food source
b．birds don't have enough bugs
c．native plants are cut down
d．green invaders
A．a，b，c，d B．b，d，c，a C．d，c，a，b D．d，c，b，a．
分析 本文主要写了外来植物对当地的大自然带来的威胁，人们应该明白并采取措施抵御．
解答 60．B标题归纳题．本文主要写了外来植物对当地的大自然带来的威胁，所以答案选B．
61．A 猜测词义题．根据句子That means they eat only certain plants．Monarch butterfly caterpillars （毛毛虫），for example，feed on milkweed这意味着他们只吃某些植物．例如，毛毛虫吃milkweed．可以猜测milkweed是一种植物．所以答案选A．
62．C 细节理解题．根据最后一段的句子Many local garden centers sell native plants．Planting the right things makes a real difference，and fast．多当地的园艺中心出售当地的植物，种植正确的植物有很大的区别，而且速度很快．可见抵挡外来植物的侵袭是有办法和成效的，所以C选项认为没有办法使错误的，故答案选C．
63．C 细节理解题．根据句子But when we plant non-native plants，we are clobbering the food web，because then we don't have the insects the birds need to live．"…Fewer of the right plants mean fewer bugs，and fewer bugs mean fewer birds当我们种植外来植物，我们破坏自然界的食物网，因为那时我们没有鸟类赖以生存的昆虫．"较少的植物意味着更少的虫子，更少的虫子意味着更少的鸟类．所以答案选顺序选C．
点评 阅读理解题测试考生在阅读基础上的逻辑推理能力，要求考生根据文章所述事件的逻辑关系，对未说明的趋势或结局作出合理的推断；或根据作者所阐述的观点理论，对文章未涉及的现象、事例给以解释．考生首先要仔细阅读短文，完整了解信息，准确把握作者观点．
