题干

亚氯酸钠是一种高效氧化剂漂白剂,主要用于棉纺、亚麻、纸浆等漂白。NaClO2在溶液中可生成ClO2、HClO2、ClO2-、Cl-等四种含氯微粒,经测定,25℃时各组分含量随pH变化情况如图所示(Cl-没有画出)。则下列分析错误的是(   )

A:亚氯酸钠在碱性条件下较稳定

B:25℃时,HClO2的电离平衡常数的数值Ka=10-6

C:25℃,pH=3时NaClO2溶液中c(Na+)+c(H+)=c(ClO2-)+c(OH-)

D:若浓度均为0.1mol/L的HClO2溶液和NaClO2溶液等体积混合后所得溶液显酸性,溶液中有关微粒的浓度由大到小的顺序为c(ClO2-)>c(Na+)>c(HClO2)>c(H+)>c(OH-)

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C

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Saving money while traveling

    There are a lot of matters to think on before going out on a trip.  If you fail to plan the trip properly, then money will simply let itself loose from your pocket. Moreover, if you haven't planned a road map of your tour,  then confusion is quite inevitable (必然的). ____

    Package tours. Tours and travel agencies have attractive offers for tourists wanting to spend a couple of days on trips. ____ Once you have accepted the package tour, all your expenses during the travel will be greatly reduced. You can save a lot in lodging(住宿 ) and traveling.

    Inexpensive lodging. Never choose expensive lodging if your tour is a low-budget one. People tend to spend a lot booking luxury hotels (豪华旅馆),  and save little to enjoy other activities during the trip. This idea is absolutely not wise when spending limited money on the trip is your main aim. Moreover, the expenses increase quickly when your kids are with you. ____ You can use the money saved on good food and amusement.

    ____ The peak season is the time when rates are sky high due to the increase of millions of tourists who can afford to spend a lot of money. You, not being amongst this crowd that can spend generously, must book your holidays during the off season.

    A guide map. Make a guide map about the places to visit, expenses of travel and the activities to try. While planning you should also estimate (估计) your total expenses. Calculate the maximum amount and try to spend less than that. ____ Refer to the guide map while traveling and follow the money-saving travel tips as much as possible.

A. Reduce shopping.

B. Off season travel.

C. You must keep yourself updated with such offers.

D. This will help you to keep actual expenses below the estimated.

E. You can save lots of dollars when you don't have a credit card.

F. Therefore, book a fairly low-price lodge to save a few dollars.

G. So knowing some money-saving travel tips becomes necessary for you.