问答题

Animals have a natural ________ for survival.
A extinction
B distinction
C institution
D instinct

A.
A

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________ fame and fortune, she was basically an unhappy woman.
A In case of
B In consequence of
C In spite of
D In care of

单项选择题

浓度为 0.1mol/L 的下列酸，能用 NaOH 溶液直接准确滴定的是() 。
A.HCOOH(pKa=3.45)
B.H3BO3(pKa=9.22)
C.NH4NO3(pKb=4.74)
D.H2O2(pKa=12)

A.1mol/L
B.HCOOH(pKa=3.45)
B.H3BO3(pKa=9.22)
C.NH4NO3(pKb=4.74)
D.H2O2(pKa=12)