SECTION B PASSAGES
Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
听力原文: Betty can speak Spanish and French. And what helped her most in learning those languages was.. well, she studies both languages in high school, and she' s still studying Spanish here at the university. Traveling bas probably been not help to her. She' s lucky in that she' s lived in Europe. Besides, after studying a language, practice is very useful. When living in a country where the language is spoken, it' s ideal. But, you know, sometimes, it' s difficult to make friends in a new place, even when the people arc very friendly. This is particularly important especially if you don' t speak the language too well. Betty !tad some problems when she first moved to Europe. Whether or not you arc living in a country where the language is spoken, you should go to movies, and whenever you can, you watch TV or listen to the radio in the language you arc trying to learn. In addition, reading is another good way to learn. Books are good, but newspaper and magazine arc even better. But, do remember that it is not possible to take advantage of practice opportunities without some knowledge of the language first. So, it might be a good idea to study grammar, vocabulary first.
What helped Betty most in learning Spanish?
A.The language laboratory.
B.Travel.
C.Studying in high school.
D.Going to movie and watching -TV.
第2题
用EDTA滴定Ca2+,Mg2+总量时,以______作指示剂,溶液的pH应控制在______,滴定到达终点时,溶液由______色变为______;滴定Ca2+时,以______指示剂,溶液的pH则应控制在______。
第3题
第4题
A.Mg-铬黑T的颜色变为铬黑T
B.铬黑T的颜色变为MgY
C.铬黑T的颜色变为Mg-铬黑T
D.MgY的颜色变为铬黑T
第6题
A.铬黑T的颜色
B.铬黑T与EDTA配合物的颜色
C.Mg2+与EDTA 配合物的颜色
D.Mg2+与铬黑T配合物的颜色
第7题
pH=10时,在水样中加入铬黑T指示剂时,水样呈酒红色。当用EDTA标准溶液滴定水样时,水样呈现指示剂颜色,即由酒红色变为蓝色,滴定达到终点。
第8题
某溶液主要含有Ca2+、Mg2+及少量Fe3+、Al3+,若在PH=10时加入适量三乙醇胺,以EDTA标准溶液滴定,用铬黑T为指示剂,则测出的是()。
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