分类法在化学学科的发展中起到了非常重要的作用,下列分类标准合理的是
| A.根据是否具有丁达尔效应,将分散系分为溶液、浊液和胶体 |
| B.根据反应中是否有电子转移,将化学反应分为氧化还原反应和非氧化还原反应 |
| C.根据水溶液是否能够导电,将物质分为电解质和非电解质 |
| D.根据是否含氧元素,将物质分为氧化剂和还原剂 |
Jenny nearly missed the flight______ doing too much shopping.
| A.as a result of | B.on top of | C.in front of | D.in need of |
The CDs are on sale! Buy one and you get ______ completely free.
| A.other | B.others | C.one | D.ones ks |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A.continued | B.immediate | C.careful | D.general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A.as | B.if | C.though | D.unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A.most | B.more | C.less | D.little |