【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.
【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。
【单选题】Thanks for ______ me to go to your party. [ ]
【简答题】A.Go to the hotel. B.Get on a bus. C.Ask for a taxi. D.Ask another person.