知识就是力量. is power. 查看更多

 

题目列表(包括答案和解析)

】阅读《塑料瓶装水真的干净吗》完成下面题目(7分)
①出门在外,口渴的时候我们都习惯买一瓶水喝,瓶装水给我们的印象是干净和方便,尤其是高档瓶装水都会标榜自己“出身清白”,“从未受到过人类污染”。例如,“王岛云雨”产自澳大利亚塔斯马尼亚岛,那里号称拥有世界上“最干净的空气”,雨水自然清洁无比;“公元前1万年”产自号称“地球上最古老的水源”——加拿大卑诗省沿岸的冰川,水质更是纯正无比。然而,科学家指出,塑料瓶装水也有可能“不干净”。
②英国化学研究人员威廉·肖迪克表示,装饮用水的塑料瓶生产过程就有污染隐患,因为在制造瓶子的过程中,会使用含有锑元素的化合物作催化剂,随着塑料瓶的成型,锑元素也进入了塑料中。塑料瓶可能会持续向瓶中的水溶解重金属元素锑,这种元素长期积聚在体内可能危害健康。威廉·肖迪克对当地的15种热销瓶装水进行化学检验,结果发现天然地下水中的锑含量是万亿分之一,而刚出厂的瓶装水的锑含量平均为万亿分之一百六十。时间越长,塑料瓶中的锑元素在水中的溶解量越大,这个过程就像泡茶一样。出厂3个月后,瓶装水中的锑元素的含量竟然增加了一倍。然而,现在市场上大多数瓶装水包装上注明的保质期大多是24个月。另外,温度越高,锑元素在水中的溶解量越大,而人们对瓶装水需求量较大的季节是温度高的夏天。肖迪克表示,虽然摄入极少量的锑元素不会导致人生病,但是大量摄入则会诱发呕吐,甚至可能致命。
③美国哈佛大学的研究人员米歇尔等人发现,不少塑料瓶在加工过程中会加入名为“双酚A”(BPA)的化学物质。这种化学物质与出生缺陷、发育问题、心脏病和糖尿病患病风险高有关联。专家对它可能对人体健康造成的影响表示担忧,而一些国家已将该物质正式列为有毒物质。
④此外,荷兰研究者发现,瓶装矿泉水经常被细菌和真菌污染,污染的瓶装矿泉水对健康个体致病的危险可能有限,但对于免疫功能低下的病人和婴儿,则有更高的感染危险。
⑤英国“水与环境管理协会”的执行主席尼克·里夫斯还表示,瓶装水对环境的污染也不容忽视。全世界每年用于制造塑料瓶的塑料为270万吨,这些塑料的原料大多是从石油中提取的,仅在美国,制造这些塑料瓶就要消耗150万桶石油,这些石油可以供10万辆汽车使用一年。86%的塑料水瓶最后都变成了垃圾,需要400年至1000年才能降解。这些塑料垃圾在燃烧时会产生有毒气体和含有重金属的灰烬。
(摘自2011年5月《知识就是力量》,略有删改)
A.随着温度增高,时间增加,塑料瓶中的锑元素在水中溶解量会越大。
B.重金属元素锑一旦被人体摄入,就会诱发呕吐,甚至可能致命。
C.全世界每年用于制造塑料瓶的塑料为270万吨,这些塑料的原料大多是从石油中提取的。
D.专家认为,在塑料瓶加工过程中所加入的名为“双酚A”(BPA)的化学物质可能对人体健康造成影响。
【小题1】下列句中划线词语能否删去?为什么(4分)
(1)出厂3个月后,瓶装水中的锑元素的含量竟然增加了一倍。
(2)瓶装矿泉水经常被细菌和真菌污染,污染的瓶装矿泉水对健康个体致病的危险可能有限,

查看答案和解析>>

根据汉语提示,完成句子(每空一词)共6分
【小题1】The drought of 2011 was terrible and had a huge ______(影响)on our lives.
【小题2】 Bolt (博尔特)is a magic __      _(赛跑运动员) in the world ,I think .
【小题3】We couldn’t help_   ___(大笑)when we watch Zhao Benshan’s performances .
【小题4】The book belongs to _____(她), for her name is on the cover.
【小题5】As a saying goes, ________ (知识)is power. We should work hard at all my subjects.
【小题6】Everyone should know the _______(重要性)of learning English well..

查看答案和解析>>

A group of frogs were traveling through the forests, but unluckily two of them fell into a hole. The other frogs tried to help them. When they saw how 51 the hole was, they cried to the two frogs that they could not be saved. The two frogs didn’t 52 and tried their best to jump up out of the hole. The other frogs 53 saying that they were sure to die. 54, one of the two frogs, who heard what the other frogs were saying, 55 . Then he fell down and died.
The other frog, however, 56 to jump as hard as he could, and at last made it out. When he 57 , the other frogs asked, "Didn’t you hear us?" The frog, who had a poor 58, explained, "I thought you were encouraging me all the timid."
The story teaches us a 59 : There is power(力量) of life and death in the tongue. An 60  word to those who are down can help them out while a discouraging word can kill them.

【小题1】
A.smallB.deepC.bigD.wide
【小题2】
A.careB.refuseC.insistD.think
【小题3】
A.keptB.finishedC.practicedD.stopped
【小题4】
A.LuckilyB.FinallyC.SuddenlyD.Happily
【小题5】
A.went onB.ran away C.jumped outD.gave up
【小题6】
A.happenedB.continuedC.plannedD.wanted
【小题7】
A.got outB.ran awayC.got offD.woke up
【小题8】
A.smellingB.eyesightC.hearingD.looking
【小题9】
A.wayB.skillC.sentenceD.lesson
【小题10】
A.interestingB.excitingC.excellentD.encouraging

查看答案和解析>>

根据汉语提示,完成句子(每空一词)共6分

1.The drought of 2011 was terrible and had a huge ______(影响)on our lives.

2. Bolt (博尔特)is a magic __      _(赛跑运动员) in the world ,I think .

3.We couldn’t help_   ___(大笑)when we watch Zhao Benshan’s performances .

4.The book belongs to _____(她), for her name is on the cover.

5.As a saying goes, ________ (知识)is power. We should work hard at all my subjects.

6.Everyone should know the _______(重要性)of learning English well..

 

查看答案和解析>>

A group of frogs were traveling1 the forests, but suddenly two of them fell into a hole. The other frogs tried to help them. When they saw how deep the hole was, they cried to the two frogs that they could not be saved. The two frogs didn’t 2 and tried their best to jump up out of the hole. The other frogs 3 saying that they were sure to die. 4, one of the two frogs, who heard what the other frogs were saying, gave up. Then he fell down and died.
The 5 frog, however, continued to jump as 6 as he could, and at last made it out. When he 7 , the other frogs asked, "Didn’t you hear us?" The frog, who had a poor 8, said, "I thought you were encouraging me all the time."
The story teaches us a 9:There is power(力量) of life and death in the tongue. An encouraging 10 to those who are down can help them out while a discouraging word can kill them.
(   )1. A. across             B. through             C. from              D. past
(   )2. A. care               B. understand           C. know            D. think
(   )3. A. kept               B. finished            C. practiced          D. stopped
(   )4. A. Luckily            B. Finally             C. Suddenly          D. Happily
(   )5. A. another            B. other               C. others           D. one
(   )6. A. wide             B. tall                 C. hard            D. far
(   )7. A. got out            B. ran away           C. got off              D. woke up
(   )8. A. smelling            B. eyesight            C. hearing             D. looking
(   )9. A. way                B. skill                C. sentence            D. lesson
(   )10. A. smile            B. laugh               C. help              D. word

查看答案和解析>>


同步练习册答案