最易出现胸腔外转移的是哪型肺癌
A．鳞状上皮细胞癌
B．腺癌
C．大细胞癌
D．小细胞癌
E．腺鳞癌
参考答案：D
已知直线x－2ay－3＝0为圆x2＋y2－2x＋2y－3＝0的一条对称轴，则实数a＝ ．
______ you are familiar with the author’s ideas, try reading all the sections as quickly as possible.
A．Now that
B．Ever since
C．In case
D．As long as
