在298K 1．0l×l05Pa下，将32g SO2通入750mL 1mol／L KOH溶液中充分反应．测得反应放出xkJ的热量。已知在该条件下，lmol SO2通入1 L 2mol／L KOH溶液中充分反应放出ykJ的热量。则SO2与KOH溶液反应生成KHSO3
的热化学方程式正确的是（ ）
| A．SO2(g)+KOH(aq)=KHSO3(aq)△H=-（4x-y）kJ／mol |
| B．SO2（g）+KOH（aq）=KHSO3（aq）△H=-（2x-y）kJ／mol |
| C．SO2（g）+KOH（aq）=KHSO3（aq）△H=-(2y-x)kJ／mol |
| D．2SO2(g)+2KOH（1）=2KHSO3（1）△H=-（8x-2y）kJ／mol |
Encourage your children to try new things, but try not to ___ them too hard.
| A．draw | B．strike | C．rush | D．push |
The computer was used in teaching. As a result, not only__________, but students became more interested in the lessons. 
| A．saved was teachers’ energy | B．was teachers’ energy saved |
C．teachers’ energy was saved | D．was saved teachers’ energy |
The children all turned ____ the famous actress as she entered the classroom. 
| A．looked at | B．to look at |
C．to looking at | D．look at |
Edward, you play so well. But I ______ you played the piano. 
| A．didn’t know | B．hadn’t known |
C．don’t know | D．haven’t known |
She brought with her three friends, none of ______ I had ever met before. 
| A．them | B．who | C．whom | D．these |