到目前为止，全世界已在各个地质层位中发现了油气藏，最远的是（）纪。
A、第四
B、第三
C、白垩
D、震旦
参考答案：A
— Do you like cooking, Serena?
— ______. Luckily, I’ve never had to worry about it. My husband will do the job.
A．Never mind
B．Not really
C．All right
D．No way
两位数乘两位数，积一定是三位数．______．
