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 （毛毛蟲），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 本文主要寫了外來植物對當地的大自然帶來的威脅，人們應該明白并采取措施抵御．
解答 60．B標題歸納題．本文主要寫了外來植物對當地的大自然帶來的威脅，所以答案選B．
61．A 猜測詞義題．根據句子That means they eat only certain plants．Monarch butterfly caterpillars （毛毛蟲），for example，feed on milkweed這意味著他們只吃某些植物．例如，毛毛蟲吃milkweed．可以猜測milkweed是一種植物．所以答案選A．
62．C 細節理解題．根據最后一段的句子Many local garden centers sell native plants．Planting the right things makes a real difference，and fast．多當地的園藝中心出售當地的植物，種植正確的植物有很大的區別，而且速度很快．可見抵擋外來植物的侵襲是有辦法和成效的，所以C選項認為沒有辦法使錯誤的，故答案選C．
63．C 細節理解題．根據句子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當我們種植外來植物，我們破壞自然界的食物網，因為那時我們沒有鳥類賴以生存的昆蟲．"較少的植物意味著更少的蟲子，更少的蟲子意味著更少的鳥類．所以答案選順序選C．
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