婷婷被蚊子叮咬后，痛痒难忍（蚊虫分泌一种蚁酸）。妈妈给她买了一种“绿膏药”，其主要成分中有稀氨水，抹上后果然有效。请你说说其中的化学原理，并据此谈谈同类反应原理在生产生活中还有哪些应用？（至少两点）
酸和碱之间发生中和反应 中和酸性土壤用Ca（OH）2
题目分析：根据题意，蚊虫能分泌一种蚁酸，显酸性，而“绿药膏”的成分中有稀氨水，显碱性，稀氨水与蚁酸发生了中和反应，从而把酸性物质反应掉；农业上改变土壤的酸碱性（或熟石灰改良酸性土壤等），处理工厂排放的废水（或用熟石灰处理硫酸厂排放的废水），都是利用了这一原理。
点评：理解和熟记中和反应及其应用的相关知识，是解答本题的关键。
 The value-packed, all-inclusive sight-seeing package that combines the best of Sydney's harbour, city, bay and beach highlights. A SydneyPass gives you unlimited and flexible travel on the Explorer Buses: the 'red' Sydney Explorer shows you around our exciting city sights while the 'blue' Bondi Explorer visits Sydney Harbour bays and famous beaches. Take to the water on one of three magnificent daily harbour cruises(游船). You can also travel free on regular Sydney Buses, Sydney Ferries or CityRail services (limited area), so you can go to every corner of this beautiful city. Imagine browsing at Darling Harbour, sampling the famous seafood at Watsons Bay or enjoying the city lights on an evening ferry cruise. The possibilities and plans are endless with a SydneyPass. Wherever you decide to go, remember that bookings are not required on any of our services so tickets are treated on a first in, first seated basis. SydneyPasses are available for 3, 5 0r 7 days for use over a 7 calendar day period. With a 3 or 5 day pass you choose on which days out of the 7 you want to use it. All SydneyPasses include a free Airport Express inward trip before starting your 3, 5 or 7 days, and the return trip is valid (有效的) for 2 months from the first day your ticket was used. SydneyPass Fares
**A family is defined as 2 adults and any number of children from 4 to under 16 years of age from the same family. 小题1:A SydneyPass doesn’t offer unlimited rides on ______.
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