下列说法正确的是
| A．若高分子对应的单体只有一种，则此高聚物与单体有相同的最简式 |
| B．等物质的量的乙烯与乙醇充分燃烧时消耗氧气的质量不相等 |
| C．分子式为C6H12的某链状有机物，且6个碳原子肯定在同一平面上，则与氢气加成后产物的名称为：2，3一二甲基丁烷 |
D．有机物 的一种芳香族同分异构体能发生银镜反应 |
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 |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |