【名词&注释】
重金属(heavy metal)、澳大利亚(australia)、俄罗斯(russia)、加拿大(canada)、环境质量评价(environmental quality assessment)、可吸入颗粒物(respirable particulate matter)、凸透镜(convex lens)、非金属(nonmetal)、国土面积
[单选题]下列变化能证明分子可以再分的是【】
A. 水蒸发
B. 石蜡熔化
C. 干冰升华
D. 水通电分解
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举一反三：
[单选题]国土面积居世界前三位的国家依次是：
A. 俄罗斯、中国、美国
B. 加拿大、中国、澳大利亚
C. 俄罗斯、加拿大、中国
D. 加拿大、美国、中国
[单选题]25． Americans have ．_________at dinner．
A. milk， tea and coffee
B. milk， coffee and wine
C. coffee， tea and wine
D. hamburgers and sandwiches
[单选题]放在凸透镜(convex lens)前10厘米高的蜡烛，通过凸透镜(convex lens)折射以后成的像高15厘米，则物距的范围在（ ）
A. 小于焦距
B. 大于焦距，小于2倍焦距
C. 大于2倍焦距
D. 无法确定
[单选题]（ ）Some students prefer yellow rulers or erasers when they study for exams because yellow is the color of __________.
A. wisdom
B. purity
C. nature
D. peace
[单选题]5． Please cut _________ the meat and let's make dumplings．
A. up
B. down
C. into
D. off
[单选题]Sally is a student of Grade Eight． She always works hard (11 ) her lessons． English is her favorite (12 )． She thinks that it is as (13 ) as Chinese， but it's more difficult (14 ) than Chinese． For example， a lot of English words and expressions are hard to remember．She often carries her walkman with her， and she spends time (15 ) English tapes every day．It (16 )her listening better and better．Sally is (17 ) student in her class． She often helps her classmates (18 ) their lessons after (19 ) her homework． Most of her classmates like t0 (20 ) her when they have ques- tions． They think she is smart and outgoing．
B. in
C. at
D. for
E. of
[单选题]土壤环境质量评价指标中单项评价指标有（ ）。
A. 二氧化硫浓度
B. 重金属及有毒非金属(nonmetal)物质的含量
C. 可吸入颗粒物浓度
D. BOD5指标
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