单词：concanavalin a (con a)
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EXPLORATIONS - October 9, 2002: George Catlin, Part 2 By Paul Thompson VOICE ONE: This is Mary Tillotson. VOICE TWO: And this is Steve Ember with the Special English program EXPLORATIONS. Today we pre
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By Paul Thompson VOICE ONE: This is Mary Tillotson. VOICE TWO: And this is Steve Ember with the VOA Special English program EXPLORATIONS. A new exhibit of paintings is being shown at the Smithsonian A
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By Cathy Majtenyi Nairobi 07 February 2006 The drought ravaging the East Africa area is having a severe impact on millions of people. Experts note a steady decrease in rainfall amounts, over the past
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By Jessica Berman Washington 18 January 2006 Noma, a disfiguring mouth disease, can be found in many extremely poor countries, but the condition is especially common in sub-Saharan Africa. Noma comes
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RIO DE JANEIRO, July 16 (Xinhua) -- Avai grabbed the first win in the Brazilian Championship after ten rounds as they beat Atletico-GO 1-0 at home on Saturday. The game's only goal came in the first half by veteran striker William. Atletico-GO's goal
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RIO DE JANEIRO, July 21 (Xinhua) -- Under command of interim head coach Osmar Loss, Internacional came-from-behind on the road against Avai to win 3-1 in the 11th round of the Brazilian Championship on Thursday. The win snaps a three-game losing stre
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