艾滋病继发口咽部炎症的病原体常见于()。
A.弓形虫
B.金黄色葡萄球菌
C.白色念珠菌
D.卡氏肺孢子虫
E.新型隐球菌
参考答案:C
As I was sitting down for dinner,the telephone ________ring.
A.should
B.must
C.could
D.would
一个由KH2PO4、Na2HPO4、H2O、NH4HCO3配制的培养基中含有()种营养物质。