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| A.To build a new position for him. | B.To hold his hands warmly. |
| C.To give him a new business job. | D.To give him a warm hug. |
| A.Grandpa would be forty-one years old next year. |
| B.Jack was the last one to give the gift to his grandpa. |
| C.Others didn’t want to put his gifts together with Jack’s. |
| D.Jack’s parents give Grandpa some money for his job. |
| A.Because he would lose his position. |
| B.Because others didn’t like him at all. |
| C.Because he was moved by Jack’s gift. |
| D.Because Jack wasn’t with him that evening. |
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| A.To sleep under the moon and stars. |
| B.To breathe the clean mountain air. |
| C.To help build hiking paths in the mountains. |
| D.To spend the whole summer living in a forest. |
| A.school students should do some hiking in summer. |
| B.it’s good to do something good for others in vacation. |
| C.helping children to choose and read books is a good way. |
| D.breathing clean mountain air is good for health. |
| A.Reading for Life |
| B.A Special House Program |
| C.The Forest Centre |
| D.Young American Volunteers |
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| A.It’s the best medicine. B.Many old people like watching TV. C.You must stay safe when you are playing sports. D.You must avoid(避免) smoking and drinking. E.So don’t go to school without breakfast. |
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| A.a和b不连接时,铁片上会有金属铜析出 |
| B.a和b用导线连接时,铜片上发生的反应为:Cu2++2e-===Cu |
| C.a和b用导线连接时,电子由铜电极流向铁电极 |
| D.无论a和b是否连接,铁片均会溶解,溶液均从蓝色逐渐变成浅绿色 |
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| A.HCl和NaOH反应的中和热为ΔH=–57.3kJ/mol,则H2SO4和Ca(OH)2反应的中和热为ΔH=2×(–57.3)kJ/mol |
| B.CO(g)燃烧热ΔH=–283.0kJ/mol,则2CO2(g) =" 2CO(g)" + O2(g)反应的ΔH=+2×283.0kJ/mol |
| C.用等体积的0.50mol·L-1盐酸、0.55mol·L-1NaOH溶液进行中和热测定的实验,会使测得的值偏大 |
| D.1mol甲烷燃烧生成气态水和二氧化碳所放出的热量是甲烷的燃烧热 |
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| A.②④⑥ | B.①②③ | C.②③⑤ | D.②④⑤ |
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| A.BeCl2溶液的pH<7,将其蒸干,灼烧后可得残留物Be(OH)2 |
| B.Na2BeO2溶液的pH>7,将其蒸干,灼烧后可得残留物BeO |
| C.Be(OH)2既能溶于盐酸,又能溶于NaOH溶液 |
| D.BeCl2水溶液导电性强,因此BeCl2应该是离子化合物 |
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