下列化学实验，能达到实验目的的是
| A．除去苯中混有的少量苯酚，加入溴水充分反应后，过滤 |
| B．鉴定卤代烃中的卤原子，直接加入硝酸银溶液，根据沉淀颜色，判断卤原子类型 |
| C．乙醇在170℃加热脱水，将产生的气体通入酸性高锰酸钾溶液，若能使其褪色，则证明有乙烯产生。 |
D．能否使酸性高锰酸钾溶液褪色，可以检验苯系物中是否含有 结构 |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |