问题 填空题

(5分)莽草酸(化学式:C7H10O5)是制取抗禽流感药物“达菲”的原料。 请回答:

(1)莽草酸由    种元素组成,分子中C、H、O原子个数比为            

(2) 从组成上可知莽草酸属于________(填 “有机化合物”或“无机化合物”);

(3)104.4g莽草酸含氧元素质量为          g。

(4)对1岁以上的儿童推荐按照下列“体重—剂量表”服用“达菲”:

 体重小于等于15千克15~23千克23~40千克 大于40千克
每次用量30mg45mg60mg60mg
   假如患病儿童的体重是20千克,在治疗过程中,需每天服用“达菲”胶囊(每颗胶囊含“达菲”75mg)2次,一个疗程5天,那么该患儿一个疗程共需服用          颗。

答案

(1)3    7:10:5   (2)有机化合物     (3) 48   (4) 6     

题目分析:(1)根据莽草酸(化学式:C7H10O5),莽草酸由3种元素组成,元素符号右小脚的数字表示分子中的原子个数,所以分子中C、H、O原子个数比为7:10:5

(2)有机化合物是含碳元素的化合物,所以从组成上可知莽草酸属于有机化合物

(3)根据元素的质量=物质的质量×元素的质量分数,所以104.4g莽草酸含氧元素质量=104.4g×80/174×100%=48g

(4)每天服用“达菲”胶囊2次,一个疗程5天,共10次,每次用量45mg,所以总共450mg,每颗胶囊含“达菲”75mg,所以该患儿一个疗程共需服用颗数=450mg/75mg=6

阅读理解

阅读理解。

Dear Changde Teacher Friends, 

    In my last email I forgot to mention one of the most important days of the year. National Teacher

Appreciation (感恩) Day! It is May 6 and kids all over America will bring a gift to their teachers on

that day. Traditionally, the little kids would bring a red apple for the teacher. Now, however, they

bring all kinds of gifts-flowers, fruit, candy, gift cards, and general appreciation cards. I'd like to

say a BIG "Thank you!" for all you do for your students. You have one of the most important jobs

-influencing the minds of young people. I am sure that all of you have done much to your students!

Keep up your good work!

    Here I give you a gift (Look at the picture). I wish I could give you a real one.

    Happy Teacher Appreciation Day! 

                                                                                                                           Sincerely, 

                                                                                                                           David Karber

1. National Teacher Appreciation Day is ______. [ ]

A. September 10

B. June 1

C. May 6

2. Kids will take ______ to teachers on National Teacher Appreciation Day. [ ]

A. gifts

B. apples

C. flowers

3. What did David mainly talk about in this email? [ ]

A. Some gifts for the teachers.

B. One of the most important jobs.

C. National Teacher Appreciation Day.

4. From this email, we know ______. [ ]

A. the job as a teacher in America is not important

B. David Karber has some teacher friends in Changde

C. Changde teacher friends received some real gifts from David Karber

多项选择题