题目

下列关于水的说法不正确的是（ ）                              A．水是一种氧化物                                            B．保持水化学性质的最小微粒是水分子                             C．电解水时在负极得到氢气                                       D．NH4NO3、NaCl、NaOH三者溶于水后所得溶液温度逐渐降低              I wonder __________.A. if I can keep this book for 5 daysB. can I keep this book for 5 daysC. how long can I keep this bookD. that I can keep this book for 5 days