问题 多选题

胃酸的主要成分是盐酸,胃酸过多的病人需用药物治疗.下列药物(主要成分)不能用于治疗胃酸过多的是(  )

A.NaOH

B.NaCl

C.CaCO3

D.NaHCO3

答案

A、氢氧化钠是强碱性物质,具有很强的腐蚀性,不能用于治疗胃酸过多,故A不符合题意.

B、氯化钠和盐酸不反应,故不能用来治疗胃酸过多,故B符合题意.

C、碳酸钙虽然是难溶性的盐,但是它可以和盐酸发生反应,也能够消耗盐酸,同时不会产生有害物质,所以可以治疗胃酸过多,故C不符合题意.

D、碳酸氢钠是弱碱性的物质,能够和盐酸发生反应,来治疗胃酸过多症,故D不符合题意.

故选:AB.

阅读理解

阅读理解

     Students will need to use all of their skills in order to understand the reading selections in Reader's

Choice.

     _1_ These selections provide practice on employing different reading skills to get the message of the

writer. They also give students practice in four basic reading skills:skimming, scanning, reading for

thorough comprehension, and critical reading.

     Skimming involves reading quickly through a text to get an overall idea of its contents. This kind of

rapid reading is suitable when you are trying to decide if careful reading is desirable or  __2__

     Like skimming, scanning is also quick reading. However, in this case the search is more concentrated.

__3__  When you read to find a particular date or number, you are scanning.

     Reading for thorough comprehension is carefully reading in order to understand the total  meaning of

the passage. At this level of comprehension the reader is able to summarize the author's ideas   _4_.

     Critical reading demands that a reader makes judgments about what he or she reads. This kind of

reading requires posting and answering questions such as "_5_", "Do I share the author's point of view?"

and "Am I convinced by the author's arguments and evidence?

A. Does my own experience support that of the author?

B. Reader's Choice is one of the most popular magazines in the world.

C. but has not yet made a critical evaluation of those ideas.

D. The book contains many types of selections on a wide variety of topics.

E. To scan is to read quickly in order to find out specific information.

F. Do I know about the author?

G. when there is no time to read something carefully.

多项选择题