His jokes made all of us _____. [ ]
A. laugh
B. laughing
C. to laugh
D. laughed
答案:A
抗炎作用较强,水钠潴留最强的激素:
A.醛固酮B.氢化可的松C.氟氢可的松D.倍他米松E.泼尼松
CO2通入下列各溶液中,不可能产生沉淀的是[ ]
A.氯化钙溶液
B.澄清的石灰水
C.饱和碳酸钠溶液
D.硅酸钠溶液