类风湿关节炎的遗传易感基因是（）
A.HLA-B27
B.HLA-DR2
C.HLA-DR3
D.HLA-DR4
E.HLA-DR5
参考答案：D
For passengers traveling into the city, taxis and car services charge ________ 50 dollars.
A．immediately
B．approximately
C．relatively
D．decreasingly
一个数越大，它的倒数就越大．______．（判断对错）
