Excle操作中，假设A1,B1,C1,D1,四个单元格的内容分别是2，3，7，3，则SUM（A1：C1）/D1的值为（）

______wegavehimtoeat,hewouldsaveitupforhislittlesister.

Muchhard______hetried，hefailedtocatchupwiththefirstrunner.

Mostanimalshavelittleconnectionwithanimalsofadifferentspecies,______theyhuntthemforfood.

______hethoughthewashelpinguswiththework,hewasactuallyintheway.

______yourcompositioncarefully,somespellingmistakescanbeavoided.

Iwouldneverspeaktosomeonelikethat______theysaidsomethingunpleasanttome.

Johnmayphonetonight.Idon’twanttogoout______hephones.

—AreyouthinkingaboutgoingtoNewYorkfortheholiday?—No.ButifI______thetime,Iwoulddefinitelygo.

Theywouldgoonworking______itwaslateatnight.

个人独资企业需要缴纳的税种及其比例是（）

B

下列哪些违法行为不可以采取扣留机动车驾驶证的行政强制措施?（）

使用易燃易爆的化学药品，不正确的操作是（）

今欲配制一pH=7.20的缓冲溶液,所用0.10mol/LH3PO4和0.10mol/LNaOH溶液的体积比是(H3PO4的pKa1~pKa3分别是2.12,7.20,12.36)

计算分析浓度均为0.10mol∙L-1的Na2HPO4水溶液的pH值()。(已知H3PO4的pKa1～pKa3分别是2.12、7.20、12.36.)

Ka2相当于两性物质中酸组分的Ka Na2HPO4作为酸时的解离常数为Ka3Ka1相当于两性物质中碱组分的共轭酸的Ka Na2HPO4作为碱，其共轭酸NaH2PO4的解离常数为Ka2= pH=-lg[H+]=9.78