盐酸利多卡因在酸性溶液中与氯化钴试液反应，生成亮绿色的细小钻盐沉淀
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The first paragraph of the parents’ letter has a_________
A. tragic tone.
B. prideful tone.
C. pleading tone.
In its third paragraph, the parents’ letter takes on a _______
A. distressed tone.
B. revengeful tone.
C. doubtful tone.
The parents’ letter ends in a(n) ________
A. instructive tone.
B. bewildered tone.
C. sentimental tone.
The purpose of much of the parents’ letter is to ________
A. inform Ann Landers of their daughter’s situation.
B. persuade Ann Landers to convince their daughter to leave her school.
C. amuse Ann Landers with the ridiculous behavior of today’s college students.
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