下列生活中的变化，其中涉及化学变化的是（　　）

    It's important to prepare for rainy days. Similarly, it's important to save money.____Why? It's because they've got used to spending all the money they make. Sometimes, the hardest thing about saving money is just getting started. Here are some tips to help you save money.

    ____The first step in saving money is to know how much you're spending. For one month, keep a record of everything you spend money on. Once you have your data, organize these numbers by category(类别) and get the total amount for each.

    You can make a budget(预算). Now that you have a good idea of how much you spend in a month, what can you do now?____To plan your spending, you can build a budget. In this way, you can limit over-spending and make sure that you put money away for unexpected situations.

    ____Doing so make it much easier to get started. Begin by deciding how long it will take to reach each goal. Some short-term goals include starting a fund to cover 6 months to a year of living costs and saving money for a vacation. Long-term saving goals are often several years or even decades away and can include saving for retirement and putting money away for a child's college education.

    Make saving money easier with automatic transfers (自动转帐). Automatic transfers to your savings account are very helpful.____By moving money out of your checking account, you'll be less likely to spend money you plan to use for savings.

A. You can set savings goals.

B. You can record your costs.

C. You can plan your spending.

D. You can keep a record of what you do.

E. They can make saving money much easier.

F. However, some people find it hard to save money.

G. You can move money out of your savings account.

阅读欢乐岛。

种田无土地

由于科技进步，人们正在向农业工厂化进军。实现农业工厂化的关键技术是无土栽培。所谓无土栽培就是利用营养液、容器或沙砾等，依照作物对土壤的要求，人为地创造作物生长的最佳环境。

无土栽培有许多优点：一是能节约土地，在太空、沙漠盐碱地以及人口稠密的城市等少土或无土的地方，均能建设成理想良田；二是管理方便，能人为地满足植物对温、光、水、肥、气的要求；三是不受自然灾害的影响，能确保丰收；四是不受农时季节约束，可根据市场行情，实行全年播种收获；五是可避免因土地连作而带来的各种病虫害。