现代议会制度的发源地是[ ]
A.美国
B.英国
C.法国
D.德国
答案:B
John decided to buy a computer, _________ it was a little expensive for him.
A.though
B.however
C.because
D.when
与CT诊断定性无关的因素是()
A.病人的体型
B.病程的长短
C.辐射发射的时间
D.病人的呼吸
E.病变的性质