【单选题】Passage Four Have you ever heard of a flower whose seeds are carried and spread by elephants? The rafflesia, a rare blossom, is very unusual. Found in the rain forests of Sumatra, the rafflesia is the...
【单选题】Conservationists may be miscalculating the numbers of the threatened animals such as elephants, say African and American researchers. The error occurs because of a flaw in the way they estimate animal...
【单选题】Most of the elephants you see are Indian elephants. But sometimes you see an African elephant. You can easily tell the two apart by looking at their ears. African elephants have ears at least twice as...