题目

China has produced        this year as it did in 1996. A.as much steel twice                                       B.as twice much steel C.twice steel as much                                        D. twice as much steel 答案：D 解析: 本题考查倍数表达方法：倍数+as+形容词/副词+as+比较对象。如图，∠BAC的平分线与BC的垂直平分线相交于点D，DE⊥AB，DF⊥AC，垂足分别为E、F，AB=6，AC=3，求BE的长．