钢材中硫含量过多会引起钢材的（）；磷含量过多会引起钢材的（）。
参考答案：热脆，冷脆
— Why are you always yawning, Kathy?
—I ______ all night reading Steve Jobs. That’s a fantastic book!
A．stayed up
B．am staying up
C．stay up
D．will stay up
崇高的特征是什么？
