下列关于糖类的说法中正确的是
| A.葡萄糖不能发生水解反应,是最简单的醛糖 |
| B.淀粉可用于制备葡萄糖、酿制食醋、酿酒 |
| C.蔗糖是最甜的糖 |
| D.葡萄糖是醛糖具有还原性;果糖是酮糖,在碱性条件下能发生银镜反应 |
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 |