炼钢一般希望铁水中的硫含量（），最高不能大于0.07%，否则会造成冶炼困难。
参考答案：≤0.05%
开、停车信号应备（）。
A、声光信号
B、音响信号
C、灯光信号
按要求完成句子。
1. Mike is the tallest boy in our class.(改为同义句)
Mike is _______than any other boy in our class.
2. the, seats, comfortable, most, Movie Palace, has.(连词成句)
.
3. I think Tom is the youngest student.(改为否定句)
4. I take a bus to school.(改为同义句)
I_______to school _______ _______.
5. He speaks English worse than any other student in his class.(改为同义句)
He speaks English _______in his class.
