【名词&注释】
生物技术(biotechnology)、科学家(scientist)、漫反射(diffuse reflection)、硝酸钾(potassium nitrate)、水溶液(aqueous solution)、平面镜成像(flat mirror images)、光的直线传播、卵细胞(egg cell)、溶解度变化(dissolving variation)、克隆羊“多莉”
[单选题]夏日炎炎,人们总喜欢躲在大树的阴影下乘凉,树荫的形成是由于 【 】
A. 光的直线传播
B. 光的漫反射
C. 光的折射
D. 平面镜成像
查看答案&解析
举一反三：
[单选题]27． When Johnny's parents saw the report， they were happy because ________．
A. Johnny was good at maths
B. Johnny loved computers
C. Johnny could jom one computer to another
D. they thought Johnny was not poor in English longer
[单选题]BIt was snowing very hard for days． Jigs and Reels had nothing to eat for a day． They knew that things weren't right at home，so yesterday morning they wanted to go out． Bob put them out through a window． Because the snow was so thick outside that he couldn't open the door．
A. "Dead， Bob said to himself． "They are only five months old． This weather will kill them． Just then Bob heard them calling him． He looked out and could not believe’they were drawing(拖) a big hare(野兔) through the snow． They threw it through the window into Bob’s hands． Hare for dinner! '
B. Who were Jigs and Reels in this story?
C. They were Bob's children
D. They were dogs．
E. They were hares．
F. They were toys．
[单选题]科学家利用现代生物技术成功培育出克隆羊“多莉”，多莉真正的母亲是( )
A. 提供乳腺细胞的亲羊
B. 提供卵细胞(egg cell)的亲羊
C. 将多莉生出来的亲羊
D. 进行细胞重组后体外培养的试管
[单选题]下列关于溶液的说法，不正确的是（ ）
A. 冷却或加入硝酸钾固体都能使接近饱和的硝酸钾溶液达到饱和
B. 汗水浸湿的衣服晾干后出现白色斑迹，是因为水分蒸发后盐分结晶析出
C. 氨水是氨气的水溶液，根据气体溶解度变化(dissolving variation)规律，贮存时要阴凉密封
D. 氯化钠在20℃时溶解度是36g，则100g的氯化钠溶液中含有氯化钠36g
[单选题]
A. satisfied
B. strict
C. patient
D. careful
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