苄星青霉素为长效之际，肌内注射()万单位后血中低浓度可维持4周。
A60
B80
C100
D120
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治疗流行性脑膜炎应首选()
A磺胺嘧啶
B青霉素
C红霉素
D林可霉素
金黄色葡萄球菌引起的急性骨髓炎，最佳选药是()
A庆大霉素
B红霉素
C青霉素G
D林可霉素
不良反应为假摸性肠炎的是()
A红霉素
B林可霉素
C青霉素
D万古霉素
人们有了更多的闲暇时间，因而对各种服务的需求增长得如此快。
A. People now have more leisure time, that is why the demand for services has increased so rapidly.
B. People now have more leisure time, which is the reason why the demand for services has increased so rapidly.
C. People now have more leisure time, which is the reason why the demand for services has been increased so rapidly.
D. People now have more leisure time, which is why the demand for services has been increased so rapidly.
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