55.A.on
B.to
C.until
D.after
答案 C [not...until...直到……才……。]
第三部分 阅读理解(共20小题;每小题2分,满分40分)
阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。
A
Britain's seed bank,the only one in the world aiming to collect all of the planet's wild plant species,has reached its goal of banking 10 percent by 2010.
The Millennium Seed Bank Project,run by Kew Gardens-one of the oldest botanical gardens-will officially deposit the 24,200th species on Thursday,a pink,wild banana from China.More than 50 countries are now on board with Kew's giant task but vast places of the globe,including India and Brazil,still need to join in and donate seeds,director Paul Smith said.
The seed bank is one of the largest and most diverse in the world with more than 1.5 billion seeds.Its goal is to help protect the planet's biodiversity during a time of climate change.
The wild banana seed is under threat of extinction(灭绝)in Southwest China from agricultural development.It is a vital food source for Asian elephants and important for growing bananas for human consumption.
Stored at minus 20 degrees centigrade,the seeds can last for thousands of years and await the day that scientists hope never comes when the species no longer exist in the wild.
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