Question

閱讀理解 　　Green attackers are taking over America．No．Not attackers from space, just plants．You might not think of plants as dangerous, but in this case they are threatening nature's delicate(脆弱的)food web． 　　The attackers 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, and 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 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． 　　Pretty orange and black monarch butterflies, for example, can only dine on one plant：milkweed．If people cut down milkweed and replace it with something else, the butterflies starve, because their bodies cannot accept any other food． 　　But 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(小蟲)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 hitting 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． (1) In the author's opinion, what kind of plant is dangerous? [　　] A． Poisonous plants． B． Native plants． C． Non-native plants． D． Gene-modified plants． (2) How did those non-native plants arrive in America? [　　] A． They were brought in by big companies． B． They were carried by visitors and immigrants． C． They were spread by big winds across oceans． D． They were planted by foreign gardeners． (3) What are the specialized plants for the 90％ of American plant-eating insects? [　　] A． The plants that make gardens and yards look pretty． B． The native plants existing before humans came to America． C． The plants that need living environment like milkweed． D． The plants carried by the first settlers． (4) By writing the passage, the author wanted to ________． [　　] A． explain how food web is made up B． suggest protecting native plants C． suggest protecting our environment D． teach us some knowledge about biology

Answer 1

答案：1．C;2．B;3．B;4．B;