男,45岁。近一个月体重急剧下降,查体可见全身多处淋巴结肿大,肛周、生殖器尖锐湿疣,口唇和胸部带状疱疹、口腔粘膜糜烂、充血、有乳酪状覆盖物。HIV病毒抗体阳性。诊断为“艾滋病”。下列治疗错误的是
A. 营养干预可以改善艾滋病患者生活质量
B. 早期患者不需要使用齐多夫定(AZT)
C. 造血干细胞移植用于治疗艾滋病费用太高,而且风险过大
D. 免疫调节药物由于过敏反应导致其效果短暂或难以肯定
E. 复方磺胺甲噁唑可用于治疗机会性感染性疾病卡氏肺囊虫肺炎
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About 71% of the earth _______ covered by water.
A. is
B. are
C. be
D. am
The number of the students _______ increased in recent years and a number of them ________ from the countryside.
A. have; are
B. has; is
C. has; are
D. have; is
Eachminuteandsecond _______ valuable to us.
A. is
B. are
C. being
D. to be
A knife and fork _____ on the table.
A. are
B. is
C. to be
D. be