DNA是所有生物遗传的物质基础。( )
参考答案：错
- your brother play basketball, John?
-No, he .[ ]
A. Is; isn't
B. Can; can
C. Can; can't
D. Are; isn't
在冬季，我国秦岭-淮河一线大致是哪条等温线经过的地方（ ）
A．8℃
B．0℃
C．16℃
D．-28℃
