题目

向浓度相同的Al2(SO4)3、MgSO4、(NH4)2SO4溶液中，加入等体积等浓度的BaCl2溶液时，恰好使上述三种溶液中SO42-全部沉淀，则Al2(SO4)3、MgSO4、(NH4)2SO4三种盐溶液的体积之比为 A.1:2:3                     B.3:2:1                 C.1:3:3                    D.3:1:1 答案：C阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。On June 25, two days after our kidney transplant （移植） surgeries, my daughter-in-law, supported by her nurse and my son, walked into my hospital room in Seattle．There she was, the of my kidney, smiling at the foot of my bed．That's when I realized the full _ of "to give is to receive．"This February, her kidney function continued to decline, my daughter-in-law needed a kidney transplant to ．1 told her that it would be a（n） to me to be able to donate a kidney to her．Immediately I was found compatible （相匹配的）, my as a kidney provider began． After some tests and exams with my personal physician, I flew to Seattle for testing． Whenever I "passed" one , I became more relieved．Then I received the phone call telling me I was ． which made me very happy． ,the day arrived．Before the surgery, I truly wasn't afraid; I just wanted the transplant to be ．I woke that evening, my son telling me that my left kidney was in my daughter-in-law．A strong sense of washed over me．It was one of the most _ moments of my life．A later, I got an e-mail from my daughter-in-law, saying: "Happy One-Month Anniversary!" We did have something to :1 wasn't affected much by the surgery, and more importantly, she felt like she had her back．Up to now, being able to see my daughter-in-law one of my kidneys has been one of the greatest gifts 1 have received．1.A． provider B． receiver C． operator D． doctor2.A． plan B． concept C． meaning D． advantage3.A． as B． if C． though D． unless4.A． leave B． survive C． rise D． pass5.A． attempt B． comfort C． experience D． gift6.A． challenge B． surgery C． journey D． action7.A． completing B． marking C． failing D． writing8.A． still less B． even more C． much worse D． far better9.A． difficulty B． problem C． stage D． test10.A． refused B． cured C． approved D． charged11.A． Gradually B． Finally C．Immediately D． Suddenly12.A． safe B． special C． comfortable D． secret13.A．behaving badly B． staying safe C． going wrong D． working well14.A． guilty B． sacrifice C． relief D． appreciation15.A． satisfying B． worrying C． frightening D． surprising16.A． year B． week C． moment D． month17.A． remember B． share C． celebrate D． treasure18.A． beauty B． smile C． confidence D．life19.A． benefit from B． contribute to C． care for D． focus on20.A． never B． ever C． already D． almost