单选题：Many researchers believe the oxygen level was high during pr

题目内容：

Many researchers believe the oxygen level was high during pre-animal times. A．Right
B．Wrong
C．Not mentioned

参考答案：

答案解析：

Three world-class tennis players came to contend for this ti

Three world-class tennis players came to contend for this title.A．argue B．claim

分类：理工类题型：单选题

A person's wealth is often in inverse proportion to their happiness.A．equal B．ce

分类：理工类题型：单选题

The rules are too rigid to allow for human error.A．general B．complex C．inflexibl

分类：理工类题型：单选题

回答(13)题A．accident B．harm C．experience D．model

分类：理工类题型：单选题

回答(4)题A．some B．few C．much D．little

分类：理工类题型：单选题