题目内容

AIDS is widepread in Malawi and_______.

A. the average life expectancy goes down by 10%
B. nearly 30 million are infected with HIV
C. in 2002 over 2 million died
D. there are more women infected than men

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According to the author, the number of orphans in Malawi could reach as high as ______.

A. 475,000
B. 100,000
C. 1,000,000
D. 5,000

Andrew Kayinga, 15, handicapped,________.

A. is spported by his relatives
B. thinks that he has a bright future before him
C. wants to get employment in a school
D. is not realistic about his future

浓度相同的下列阴离子的水溶液,碱度最强的是

Ac-(Ka=1.8×10-5)
B. CN-(Ka=6.2×10-10)
CO32-(Ka1=4.2×10-7; Ka2=5.6×10-11)
D. F-(Ka=3.5×10-4)

浓度为c(HCl)(mol/L)的HCl和c(NaOH)(mol/L)的NaOH混合溶液的质子平衡方程是

A. [H+] = [OH-]+c(HCl)
B. [H+]+c(NaOH) = [OH-]+c(HCl)
C. [H+]+c(NaOH) =[OH-]
D. [H+] = [OH-]+c(HCl)+c(NaOH)

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