5.下列关于有机物的说法错误的是 ( )
A.CCl4可由CH4制得,可萃取碘水中的碘
B.石油和天然气的主要成分都是碳氢化合物
C.乙醇、乙酸和乙酸乙酯能用饱和Na2CO3溶液鉴别
D.苯不能使KMnO4溶液褪色,因此苯不能发生氧化反应
4.物质发生化学变化时:①电子总数;②原子总数;③分子总数;④物质的性质;⑤物质的总质量;⑥物质的总能量,反应前后肯定发生变化的是 ( )
A.①②③⑤ B.④ C.②⑤⑥ D.④⑥
3.下列物质中,既能与NaOH溶液反应,又能与盐酸反应,还能发生水解反应的是( )
①A1Cl3 ②NaHSO4 ③(NH4)2CO3 ④
⑤NaHCO3
A.①④⑤ B.③⑤ C.④⑤ D.全部
2.配制100 mL 1.0 mol/LNa2COa溶液,下列操作正确的是 ( )
A.称取10.6 g无水碳酸钠,加人100 mL容量瓶中,加水溶解、定容
B.称取10.6 g无水碳酸钠,往烧杯中加入100 mL蒸馏水,搅拌、溶解
C.转移Na2CO3溶液时,未用玻璃棒引流,直接倒人容量瓶中
D.定容后,塞好瓶塞,反复倒转、摇匀
1.节能减排关系人类的生存环境,请从我做起。下列措施不属于“节能减排”的是( )
A.及时关灯、关空调、关水龙头,节水、节电
B.使用天然气热水器取代电热水器
C.自2008年6月1日起,实行塑料购物袋有偿使用
D.研制开发燃料电池汽车,减少机动车尾气污染
49. sounds 50. fine 51. work 52. Thanks 53. difficult
[书面表达]
One possible version:
Li Hua is a young man, my neighbor. Up to now he hasn’t found a job yet. Maybe you wonder why.
He was once advised to learn to use computer, but he thought it was difficult. When he saw others learning English, he shook his head, saying it was too hard to remember the new words. As to science and technology, in his opinion, it was too difficult to understand. What is he fond of? He enjoys watching TV, playing cards, smoking and so on. It’s hard for him to give up all these.
Not long ago, he was eager to seek for a job. When he knew that talents are greatly needed, such as computer engineers, English interpreters and technicians, he sighed and regretted the time he had wasted.
44. seems 45. with 46. showing 47. Surely 48. something
43.A。画线句子后面说“眼睛盯着灌木,找到东西可看”,故选A。arrest意为“逮捕”、“抑制”。
[对话填空]
42.D。第三段提到的侦察兵的做法告诉我们,雪盲的产生是因为在雪地里眼睛找不到具体目标,由于寻找不到看的物体才产生雪盲。人们就将灌木上的雪去掉,扔一些深色物体,其目的是D项所言内容。
41.C。第二段结尾部分“... makes eyes difficult to see clearly ...”说此时泪水流出来充满眼眶,眼睛看不清,导致雪盲。
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