【题目】关于金属在自然界中存在形式的说法中正确的是( )
A.金、银可以在自然界中以单质形式存在,是因为它们的活动性很强
B.在自然界中很难找到单质形式存在的金属,是因为金属资源太少
C.在自然界中存在最多的单质是铁
D.金属矿物广泛存在于地壳和海洋中
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【题目】 Most Chinese people like red because they think it can __________ them good luck.
A. carry B. bring C. take D. make
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【题目】 —You look very cool today, Simon.
—__________
A. Really? Thank you. B. Oh, I don’t think so.
C. No, I’m not cool at all. D. The same to you.
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【题目】Andy __________ chats with his friends after class because he is busy doing his homework.
A. always B. usually C. seldom D. often
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【题目】下列有关金属材料的叙述错误的是( )
A.回收利用废旧电池中的铅、汞等可减少对环境的污染
B.铝块能制成铝箔是利用了铝的延展性
C.铝比钢铁中的铁活泼,因而铝的抗腐蚀性能比铁差
D.在铁制品表面刷漆或镀耐腐蚀金属都可以防止铁制品锈蚀
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【题目】A
Tony and Anna are brother and sister. They are Americans. Tony likes sports very much. He can play football, basketball and volleyball. Anna likes music very much. She can’t play ball games. But they both like playing games on computers.
They like eggs, bread and milk for breakfast. For lunch, Anna likes eating vegetables and fruit, but Tony likes chicken and fish. They both like hamburgers. But they don’t like ice cream or cheese.
【1】 Anna is Tony’s __________ and they are __________.
A. sister; Chinese B. sister; Americans
C. friend; Americans D. brother; Americans
【2】 Tony likes __________ and he can play __________.
A. sports; games B. music; basketball
C. sports; volleyball D. sports; tennis
【3】Tony and Anna both like __________.
A. vegetables B. football
C. playing games D. ice cream
【4】For breakfast, they like __________.
A. eggs, bread and milk B. ice cream or cheese
C. chicken and fish D. vegetables and fruit
【5】 They don’t like __________ or __________.
A. ice cream; vegetables B. ice cream; cheese
C. chicken; fish D. hamburgers; cheese
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【题目】某同学进行“物质溶解时的吸热或放热”的探究实验:他取三支试管,向试管中分别注入5mL水,测得水的初温为20℃,再分别向三支试管中各加入3g氢氧化钠、氯化钠、硝酸铵固体,振荡。
(1)“振荡”试管的目的是__________________________________________________.
(2)用温度计分别测出三支试管中溶液的温度,高于20℃的是_______________溶液,这是因为____________________________________________________________.
(3)装有硝酸铵溶液的试管外壁有水珠产生,原因是_____________________________.
(4)由此实验探究可知___________溶于水温度没有明显的变化。
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【题目】—How long will you stay in America?
—For __________ days, and I will leave on the __________ of this month.
A. twelve; twenty B. twelfth; twentieth
C. twelfth; twenty D. twelve; twentieth
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