A：金属的性质是决定其用途的唯一因素
B：导电、导热性最好的金属是Au
C：合金相对于纯金属，其硬度更大、熔点更高
D：生铁和钢都是铁的合金，其中生铁含碳量比钢高
完成句子。①这个公园的确是个散步的好地方。
The park is ____go for a walk.②这就是我们每天要做的事。Here is ____ every day.③做这项工作要花我两天时间。It____.④你的计划进展怎样？我希望一切顺利。____ your plan ____? I hope everything is OK.⑤早餐很重要。早餐为我们整个上午提供能量。Breakfast is important. It ____ the morning.
—I think students should have mobile phones to call their parents.
— . They often use them to play games instead.
