Without proper lessons, you could _________a lot of bad habits when playing the piano.

A．set up

B．catch up

C．pick up

D．keep up

诊断颅脑损伤，目前最安全可靠的方法是()

A．SPECT

B．脑干诱发电位检查

C．脑血管造影或脑室造影

D．CT及MRI

E．X线