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【单选题】For the (26) month, mysterious falls of large chunks of ice (冰雹) (27) rained down on Spain and Italy. Juana Sanchez, a 70-year-old woman in Almeria, southern Spain, was knocked (28) when she was struc...
A.
Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account (44) the ice, scientists had to come up with a rationalization. Professor Jesus Martinez Frias, the geologist investigating the ice falls in Spain, told BBC News that the ice pieces had probably been (45) through sudden temperature drops in the stratosphere. This was the most likely explanation, he said, for the "very unusual" phenomenon.
【单选题】雷暴是由强烈的积雨云产生的,形成强烈的积雨云需要三个条件( )
A.
强大的风力、充沛的水汽、足够的冲击力。
B.
深厚而明显的不稳定气流、剧烈的温差、足够的冲击力。
C.
深厚而明显的不稳定气流、充沛的水汽、足够的冲击力。