题目

 含羞草的叶子被碰后会合拢，这说明生物具有                （    ） A、生长现象    B、应激性    C、繁殖       D、呼吸 答案：BIn the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ______ we have never experienced before, ______ makes us worried a lot about nature disasters.A. A. that; that      B. as; which         C. which; it        D. when; as