在开发利用金属矿物和海水资源过程中，下列说法不正确的是
| A．工业上可用电解法冶炼得到金属铝 |
| B．海水蒸发制海盐的过程中只发生了化学变化 |
| C．海水淡化的方法主要有蒸馏法、离子交换法等 |
| D．海水中含有钾元素，需经过氧化还原反应才可得到钾单质 |
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 |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |