流行病学的研究方法主要是（） A.描述性研究 B.分析性研究 C.实验性研究 D.理

阅读下面的短文，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   36  of my kidney, smiling at the foot of my beD．That's when I realized the full    37   of "to give is to receive．"
This February,   38  her kidney function continued to decline, my daughter-in-law needed a kidney transplant to   39 ．I told her that it would be a（n）   40  to me to be able to donate a kidney to her． Immediately I was found compatible （相匹配的）, my   41  as a kidney provider began． After  42  some tests and exams with my personal physician, I flew to Seattle for   43  testing． Whenever I "passed" one   44 , I became more relieved．Then I received the phone call telling me I was   45 ． which made me very happy．   46 , the day arriveD．Before the surgery, I truly wasn't afraid; I just wanted the transplant to be 47 ．
I woke that evening, my son telling me that my left kidney was   48  in my daughter-in-law． A strong sense of   49  washed over me． It was one of the most _50  moments of my life．
A   51  later, I got an e-mail from my daughter-in-law, saying: "Happy One-Month Anniversary!" We did have something to   52    I wasn't affected much by the surgery, and more importantly, she felt like she had her   53  back．
Up to now, being able to see my daughter-in-law   54  one of my kidneys has been one of the greatest gifts I have   55  received．

小题1:	A．provider B．receiver C．operator D．doctor

小题2:	A．plan B．concept C．meaning D．advantage

小题3:	A．as B．if C．though D．Unless

小题4:	A．leave B．survive C．rise D．pass

小题5:	A．attempt B．comfort C．experience D．gift

小题6:	A．challenge B．surgery C．journey D．action

小题7:	A．completing B．marking C．failing D．writing

小题8:	A．still less B．even more C．much worse D．far better

小题9:	A．difficulty B．problem C．stage D．test

小题10:

A．refused B．cured C．approved D．charged

小题11:

A．Gradually B．Finally C．Immediately D．Suddenly

小题12:

A．safe B．special C．comfortable D．secret

小题13:

A．behaving badly B．staying safe C．going wrong D．working well

小题14:

A．guilty B．sacrifice C．relief D．appreciation

小题15:

A．satisfying B．worrying C．frightening D．surprising

小题16:

A．year B．week C．moment D．month

小题17:

A．remember B．share C．celebrate D．treasure

小题18:

A．beauty B．smile C．confidence D．life

小题19:

A．benefit from B．contribute to C．care for D．focus on

小题20:

A．never B．ever C．already D．almost