抗SSB抗体的阳性率是()
A.70%
B.60%
C.80%
D.50%
E.以上都不是
参考答案:E
In spring, a lot of young trees _______ in our city.
A. are planted
B. plant
C. has been planted
肺癌普查首选的检查方法是()。
A.B超
B.胸部CT
C.支气管镜
D.胸部X线
E.肿瘤标记物检测