.—_________

—I have a headache.’

A．What’s the matter，Mike?

B．Where are you, Mike?

C．Who are you?

D．What are you doing, Mike?

“虎斑心”是下列（）的典型病理变化。

A．口蹄疫

B．禽流感

C．猪瘟

D．猪蓝耳病