【題目】英國(guó)科技人員研制出自動(dòng)滅火陶瓷磚,磚里壓入了一定量的氦氣和二氧化碳。這種磚砌成的房屋發(fā)生火災(zāi)時(shí),在高溫烘燒下,磚會(huì)裂開并噴出氦氣和二氧化碳,從而抑制和撲滅火焰。自動(dòng)滅火陶瓷磚的滅火原理是( )。
A.清除可燃物
B.使燃燒物與氧氣隔絕
C.降低燃燒物的著火點(diǎn)
D.使燃燒物的溫度降低到著火點(diǎn)以下
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【題目】Xiao Li, hurry up, __________ you will miss the bus.
A. but B. and C. or D. since
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【題目】My friend Sally is a sports fan(愛好者). She has a great sports collection. She has three soccer balls, five baseballs, six volleyballs and two basketballs. They are all under her bed. Sally plays basketball very well. She likes(喜歡) Kobe. She thinks he is the best(最好的)basketball player運(yùn)動(dòng)員) in America and she also(也)likes Yao Ming from(來自)China. Sally plays baseball very well, too. Now she is in her school baseball club.
【1】Sally has ____ volleyballs.
A. six B. five C. three
【2】Kobe is a ______.
A. basketball player B. teacher C. baseball player
【3】Sally plays ______ very well.
A. soccer and basketball B. volleyball and baseball C. basketball and baseball
【4】Sally is ______.
A. in her school basketball club B. a sports fan C. Kobe’s sister
【5】We(我們)can find(找到)_____ under Sally’s bed.
A. some notebooks B. a watch C. a great sports collection
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【題目】下列現(xiàn)象能證明分子在化學(xué)變化中可分的是( )。
A.100 mL水和100 mL酒精混合后總體積小于200 mL
B.打開盛裝濃鹽酸的瓶蓋,濃鹽酸逐漸減少
C.氣態(tài)氧在加壓降溫時(shí)變?yōu)榈{(lán)色的液態(tài)氧
D.加熱氧化汞得到銀白色的汞和氧氣
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【題目】I’m not good at playing __________ piano, but I can play __________ volleyball very well.
A. /; / B. the; the C. the; / D. /; the
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【題目】—Mom, I must go now. Peter is waiting for me at the cinema.
—OK! __________.
A. Good idea B. Good luck
C. Have a good time D. Best wishes
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【題目】從組成上看,溶液是由________和________組成的;從質(zhì)量上看,溶液的質(zhì)量________溶質(zhì)和溶劑的質(zhì)量之和;從體積上看,溶液的體積______溶質(zhì)和溶劑的體積之和。
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【題目】為節(jié)約資源保護(hù)環(huán)境,提倡垃圾分類回收下列生活垃圾可與鋁制易拉罐歸為一類加以回收的是( )
A.廢舊書報(bào) B.舊玻璃瓶 C.廢棄鐵鍋 D.一次性塑料飯盒
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