Read and ask.

1. A:                                    ?

    B: I ate good food on my holiday.

2. A:                                    ?

    B: I went to Nanjing.

3. A:                                    ?

    B: Yes, we played football yesterday.

4. A:                                     ?                  

    B: I have a cold.

患者，男，54岁，咳血丝痰1个月余，吸烟20余年，体检左侧呼吸音减弱，外院X线平片提示左肺门浓密影。

患者在治疗过程中，逐渐出现了四肢的麻木，四肢肌力下降，怀疑脊髓病变，首选的检查方法为

A．SPECT

B．超声

C．CT

D．MRI

E．X线平片