【題目】關于金屬在自然界中存在形式的說法中正確的是( )
A.金、銀可以在自然界中以單質形式存在,是因為它們的活動性很強
B.在自然界中很難找到單質形式存在的金屬,是因為金屬資源太少
C.在自然界中存在最多的單質是鐵
D.金屬礦物廣泛存在于地殼和海洋中
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【題目】 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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【題目】 —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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【題目】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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【題目】下列有關金屬材料的敘述錯誤的是( )
A.回收利用廢舊電池中的鉛、汞等可減少對環(huán)境的污染
B.鋁塊能制成鋁箔是利用了鋁的延展性
C.鋁比鋼鐵中的鐵活潑,因而鋁的抗腐蝕性能比鐵差
D.在鐵制品表面刷漆或鍍耐腐蝕金屬都可以防止鐵制品銹蝕
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【題目】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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【題目】某同學進行“物質溶解時的吸熱或放熱”的探究實驗:他取三支試管,向試管中分別注入5mL水,測得水的初溫為20℃,再分別向三支試管中各加入3g氫氧化鈉、氯化鈉、硝酸銨固體,振蕩。
(1)“振蕩”試管的目的是__________________________________________________.
(2)用溫度計分別測出三支試管中溶液的溫度,高于20℃的是_______________溶液,這是因為____________________________________________________________.
(3)裝有硝酸銨溶液的試管外壁有水珠產生,原因是_____________________________.
(4)由此實驗探究可知___________溶于水溫度沒有明顯的變化。
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【題目】—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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