由于合成洗涤剂、杀虫剂、病原微生物等使水污染属于( )。
A．工业污染源
B．生活污染源
C．农业污染源
D．核污染
参考答案：B
Finding information in today's world is easy. The____is how you can tell if the information you get is
useful or not.[ ]
A. ability
B. competition
C. challenge
D. knowledge
根据句意及首字母填空。
1. Although we’re twins, Liu Li is more o_______ than me. I’m quieter .
2. There’re sixty m_______ in an hour .
3. —Does your father go to work by bus or by bike ?
—Neither (都不是). He goes on f_______.
4. Her mother likes sports, so she is very a_______.
5. She never stops talking. She isn’t q_______.
