5.右下圖為某物質(zhì)的分子模型示意圖,其中“ ”代表氫原子,“ ”代表氧原子。下列敘述正確的是 ( )
A. 此物質(zhì)屬于混合物
B. 此物質(zhì)的化學(xué)式為HO
C. 此物質(zhì)的一個分子由4個原子構(gòu)成
D. 此物質(zhì)中氫元素與氧元素的質(zhì)量比是1:1
4.面值100元的新版人民幣的數(shù)字“100”采用光變色防偽油墨印刷,垂直看為綠色,傾斜看為藍(lán)色。在防偽油墨中含有MgF2,其中F元素的化合價為 ( )
A. +1 B. +2 C. -1 D. -2
3.蒸饅頭時,面堿(主要含Na2CO3)放多了會發(fā)黃。為除去過多的面堿,做饅頭時可加入適量 ( )
A. 食醋 B. 食鹽 C. 黃酒 D. 白糖
2.下列物質(zhì)中屬于氧化物的是 ( )
A. 食鹽 B. 水 C. 空氣 D. 酒精
1.運用2008年諾貝爾化學(xué)獎的研究成果,可依據(jù)生物發(fā)光現(xiàn)象檢測超微量鈣的存在。這里的“鈣”是指 ( )
A. 分子 B. 原子 C. 元素 D. 單質(zhì)
25.You much more easily in a foreign company,on condition that you have a good spoken command of English.
A.will promote B.promote C.will get promoted D.are promoted
答案 C
24.-Have you seen Jack in his office?
-Yes,he the report on the market research since eight this morning.
A.has preparing for B.has been preparing
C.prepared D.is going to prepare
答案 B
23.-Which hotel are you in?
-I in a hotel.A friend I met on the train from the south to put me up for a couple of
nights.
A.haven’t stayed;has offered B.am not staying;offered
C.am not staying;is offering D.do not stay;offers
答案 B
22.Cold winters in Europe almost entirely by 2080 because of the continuously global warming
nowadays.
A.are disappearing B.have disappeared C.will have disappeared D.will be disappeared
答案 C
21.-Why are the Woods selling their belongings?
-They to another city.
A.had moved B.have moved C.moved D.are moving
答案 D
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