关于x的方程(a-6)x²-8x+6=0有实数根，则整数a的最大值是（     ）

Boys and girls,

Attention, please! Do you know 1to keep safe in our daily（日常的）life? Today I’d like2 you some ways to keep safe.

1  Always play in a 3 place. A park is a safe place4 there are no cars or buses in it.

2  5 the traffic rules, please! Before crossing a road,6 and look both ways ——look left, look right and look left 7.

3  Never put your head or hands 8 a car, a bus or a train. Many people get 9 or lose their lives by doing so.

4  Don’t 10 a stranger（陌生人）or go with him/her.

That’s all. All the students should obey the rules anytime(任何时候).

亚．非．拉等地区的非工业国家生产的粮食和原料源源不断地运往工业化国家,工业化国家则输出工业品。这些现象主要说明第二次工业革命（   ）