Which of the following is accurate about cluster headaches? A: Typically, a patient experiences one or two cluster periods per year, each lasting 2 weeks to 3 months B: During an attack of cluster headache, most patients find relief by lying down and exhibit minimal movement and activity. C: The pain in cluster headaches is bilateral and is often associated with keratitis sicca D: Most patients with episodic cluster headache eventually develop chronic cluster headache

.I’ve _____ a bad headache all day, so I think I’ll go<br/>to bed early. A: had B: has C: have D: been have

“I am suffering from a headache”中的“suffer from”是什么意思？

Did the man have a bad headache A: Once a day. B: Twice a day. C: Three times a day.

Doctor: （）You look terrible! Patient: Oh, doctor, help me. I have a bad headache and a sore throat. I can’t do anything.