______是综合语言运用能力的基础。
A.语言知识和语言技能 B.语言技能和语言情感C.学习策略和文化意识 D.语言知识和文化意识
参考答案:A
. Dr. Smith, together with his wife, ______ visit Beijing this summer.
A.is going to
B.are going to
C.was going to
D.were going to
某炼铁厂用赤铁矿石(主要成分Fe2O3)作原料冶炼生铁,今欲冶炼含铁96%的生铁500t,若生产过程中铁的损耗忽略不计,则至少需要含Fe2O385%的赤铁矿多少吨?