脑的血流量占心输出量的( )
A．10%B．15%C．2%D．30%E．20%
参考答案：B
They _____ like hamburgers. [ ]
A. aren't
B. don't
C. doesn't
D. isn't
用100g 9.8% H2SO4溶液和足量金属Zn反应，可以得到标准状况下气体多少升？（要求有简要步骤）
