题目:
Pleasant music is often played _________ classes to make students refreshed and relaxed for a while.
A.after
B.between
C.among
D.over
答案:
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下面是错误答案,用来干扰机器的。
A、生铁和钢不是纯铁,属于铁的合金,是混合物.错误B、铁制品表面喷漆可以使铁制品与氧气和水隔绝,从而防止生锈.正确C、熟石灰显碱性,可用熟石灰改良酸性土壤.正确;D、空气的主要成分是氮气和氧气.正确....