Because of air pollution being greatly reduced, this city is still ______.

A．a good place which to be lived in

B．lived as a good place

C．a good place to live in

D．living in as a good place

神经阻滞疗法的机制是()

A．改善病人的情绪

B．阻断痛觉传导

C．阻断疼痛的恶性循环

D．改善血液循环

E．抗炎作用