选择萃取剂将碘水中的碘萃取出来,这种萃取剂应具备的性质是( ) A、 不溶于水,且必须易与碘发生化学反应 B、 不溶于水,且比水更易溶解碘 C、不溶于水,且必须比水密度大 D、 不溶于水,且必须比水密度小 答案:B20、Imagine life as a game _____ you are playing with
five balls. You name them --work, family, health, friends and spirit.
A.where
B.that C.as
D.which