问题
填空题
用括号内所给词的适当形式填空。
1. John _____ (not stay) at home yesterday.
2. We _____ (clean) our classroom a moment ago.
3. Why _____ you _____ (come)so early this morning?
4. My little brother enjoys _____ (swim) very much.
5. Kate finished _____ ( do) her homework at 10 o'clock last night.
6. When did Shakespeare start _____ (write) plays?
7. She _____ (not visit) her uncle last weekend. She _____ (stay) at home and
_____ (do) some cleaning.
8. He _____ (look) after her mum yesterday morning.
答案
2. cleaned
3. did;come
4. swimming
5. doing
6. writing
7. didn't visit;stayed;did
8. looked
选择题
1L溶液中含有下列离子,用Pt电极电解该溶液,当电路中有3mol e-通过时(忽略电解时溶液体积的变化及电极产物可能存在的溶解现象),下列说法正确的是( )
离子 | Cu2+ | Al3+ | NO3- | Cl- |
物质的量浓度(mol/L) | 1 | 1 | a | 1 |
A.电解后溶液的pH=0
B.a=3
C.阳极生成1.5molCl2
D.阴极析出的金属是铜和铝