下列关于“生物反应器”的叙述中,不正确的是[ ]
A.会对所利用的生物造成伤害
B.可以减少环境污染
C.可以生产人类所需要的某些珍贵药物
D.生产成本低
答案:A
My ruler is ______ than ______. [ ]
A. longer; his
B. longer; he
C. long; him
D. longest; him