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 |