【单选题】---When was he born? ---He was born ________the morning________June 5.
【单选题】已知H2S的pKa1=7.05, pKa2=12.90, NH3·H2O的pKb=4.75,则S2-、HS− 和NH3中碱性最强的是
【单选题】对导游人员来说,容貌端庄是( )的基本要求。
【简答题】句型转换(每题2分,共10分)1. He was born in 1991.(对画线部分提问) he born?2. I have a big bag.句型转换(每题2分,共10分) 1. He was born in 1991 .(对画线部分提问) ____ ____ he born? 2. I have a big bag. He has a small bag. My ba...
【单选题】A:When was he born? B:He was born 1st May 1990.