像出口猪牛羊鸡一样，出口观赏鱼必须来自注册饲养场。( )
参考答案：对
It is____to trave by air than by water.
A．much more exciting
B．a lot exciting
C．much excited
D．a lot more excited
ALP、DNA、RNA聚合酶、乙醇脱氢酶等均含（）
A.铁
B.铜
C.铬
D.钴
E.锌
