用粗细均匀的电热丝加热烧水，通电10 min可烧开一壶水，若将电热丝对折起来使用，电源电压不变，则烧开同样一壶水的时间是( )
| A．2.5 min | B．5 min | C．20 min | D．30 min |
用粗细均匀的电热丝加热烧水，通电10 min可烧开一壶水，若将电热丝对折起来使用，电源电压不变，则烧开同样一壶水的时间是( )
| A．2.5 min | B．5 min | C．20 min | D．30 min |
用
表示阿伏加德罗常数的数值，下列说法正确的是
表示阿伏加德罗常数的数值，下列说法正确的是A．0.1molCl 参加反应，转移的电子数一定为0.2 |
| B．0.1molO参加反应，转移的电子数一定为0.4 |
| C．0.1molAl参加反应，转移的电子数一定为0.3 |
| D．0.1molFe参加反应，转移的电子数一定为0.2 |
关于下列各装置图的叙述中，不正确的是
① ② ③ ④
① ② ③ ④
| A．用装置①精炼铜，则a极为精铜，电解质溶液为CuSO4溶液 |
| B．装置②的总反应是：Cu＋2Fe3＋＝Cu2＋＋2Fe2＋ |
| C．装置③中钢闸门应与外接电源的负极相连 |
| D．装置④中的铁钉几乎没被腐蚀 |
关于下列各装置图的叙述中，不正确的是
① ② ③ ④
① ② ③ ④
| A．用装置①精炼铜，则a极为精铜，电解质溶液为CuSO4溶液 |
| B．装置②的总反应是：Cu＋2Fe3＋＝Cu2＋＋2Fe2＋ |
| C．装置③中钢闸门应与外接电源的负极相连 |
| D．装置④中的铁钉几乎没被腐蚀 |
关于下列各装置图的叙述中，不正确的是
① ② ③ ④
① ② ③ ④
| A．用装置①精炼铜，则a极为精铜，电解质溶液为CuSO4溶液 |
| B．装置②的总反应是：Cu＋2Fe3＋＝Cu2＋＋2Fe2＋ |
| C．装置③中钢闸门应与外接电源的负极相连 |
| D．装置④中的铁钉几乎没被腐蚀 |
--- Did they have fun _____________? --- Yes, they did.
| A．to camp | B．camped | C．camping | D．camp |
--- Did they have fun _____________? --- Yes, they did.
| A．to camp | B．camped | C．camping | D．camp |
Last night we watched a movie about __________ in the future.
| A．living | B．to live | C．live | D．lived |
完形填空：（10分）
What do you do at the weekend? Some people like to 21 at home, but others like to go 22 a walk or play football. My friend Sam works hard in a factory during the 23 . At the weekend, he always 24 the same thing. On Saturday he 25 his car and on 26 he goes with his family to a village by car. His uncle and aunt have a farm there. It isn’t a 27 one but there is always 28 to do on the farm. The children help with the animals and give them their 29 . Sam and his friends help in the fields. At the end of the day, they are all 30 and Sam’s aunt gives them a big meal.
【小题1】
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What do you do at the weekend? Some people like to 21 at home, but others like to go 22 a walk or play football. My friend Sam works hard in a factory during the 23 . At the weekend, he always 24 the same thing. On Saturday he 25 his car and on 26 he goes with his family to a village by car. His uncle and aunt have a farm there. It isn’t a 27 one but there is always 28 to do on the farm. The children help with the animals and give them their 29 . Sam and his friends help in the fields. At the end of the day, they are all 30 and Sam’s aunt gives them a big meal.
【小题1】
| A．play | B．live | C．stay | D．enjoy |
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