2013年职称英语备考每日练习理工类5_第2页

　　These delicate creatures now face danger of another kind - from scientific progress. In the US, millions of farms grow genetically modified maize which is pure poison for the butterfly. Laboratory experiments have shown that half of the butterflies which feed on the leaves of genetically modified maize die within 48 hours. Not all experts agree that this variety of maize is responsible for the threat to the Monarchs. In spite of these doubts, the European Union has refused to approve new crops of genetically modified maize until further investigations have been carried out.
　　Greenpeace is campaigning against genetically modified products （in Spain, there are already 20,000 hectares of modified maize）. The environmental organization recently published a list of 100 species of butterfly in Europe alone which are threatened with extinction.
　
　　16 The Monarch butterfly travels 5,000 km each year.
　　A Right           B Wrong         C Not mentioned
　
　　17 The Monarch butterfly looks fragile.
　　A Right          B Wrong         C Not mentioned
　
　　18 The Mexicans like butterflies very much.
　　A Right          B Wrong         C Not mentioned
　
　　19 in bad winters, about 70 per cent of the butterflies can stay alive
　　A Right          B Wrong         C Not mentioned

答案:
　　　16 A　　17 A　　18 C　　19 B
　
　　20 A　　21 B　　22 C
　
 

　
　　20 In early April, the butterflies leave their winter homes flying back north
　　A Right          B Wrong         C Not mentioned
　
　　21 Genetically modified maize isn't poisonous to the butterflies.