【单选题】There is nothing in the bag, ___?
【单选题】--________a pay phone on Center Street? --Yes, there is. [ ]
【简答题】Why didn't you say you were going to be late? I've been extremely wor ried about you.
【单选题】一般冶炼一吨生铁需要铁矿石或烧结矿()。
【判断题】霍尔电压U H 与I S B的乘积成正比,与样品的厚度d成正比。
【简答题】Complete the text. Picasso is a great artist who worked in a 0 v ... ... ... ... of different (1) s................... - some realistic and others (2) a....................He developed a wide range of...