下列物质哪种是混合物:()?
A.水
B.空气
C.食盐
D.生石灰
E.二氧化碳
参考答案:B
---Mum, can I do the homework tomorrow? ---You _____ finish it today.
A.had better
B.had rather
C.had better not
D.had rather not
女性病人,入院三天,头部受伤后立即昏迷,10分钟后清醒,有呕吐,对受伤情况不能回忆,诊断是
A.脑震荡B.脑挫裂伤C.颅内血肿D.脑干损伤E.脑供血不全