单选题：Coal miners once used the canary bird to detect

题目内容：

Coal miners once used the canary bird to detect A．poisonous gases
B．air pollutio
C．water leaka g
D．radiatio

参考答案：

答案解析：

Which of the following is NOT A　social occasion?

Which of the following is NOT A　social occasion?A．Going to churc B．Going to work

分类：理工类题型：单选题

It is more difficult for today's athletes_____________A．to a void psychological

分类：理工类题型：单选题

根据下列文章,请回答题。The Science of Sport1 At the 2004 Olympic Ga mes in Athens, the Chin

分类：理工类题型：单选题

油罐底焊接完毕后，一般进行严密性试验的方法是（　　）。A．煤油试漏法 B．真空箱试验法 C．化学试验法 D．压缩空气试验法

分类：理工类题型：单选题

根据下列文章,请回答题。Science and Truth“FINAGLE”(欺骗)is not a word that most people associa

分类：理工类题型：单选题