B．In any language, some letters are used more than others.

　　C．Only people who know the keyword can read the message.

　　D．As long as there have been codes, people have tried to break them.

　　E．You can hide a message by having the first letters of each word spell it out.

　　F．With a code book, you might write down words that would stand for other words.

　　G．Another way to hide a message is to use symbols to stand for specific letters of the alphabet.

　　Passage 2　(2016·全国Ⅱ)

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　A garden that’s just right for you

　　Have you ever visited a garden that seemed just right for you, where the atmosphere of the garden appeared to total more than the sum(总和) of its parts？__1__．But it doesn’t happen by accident.It starts with looking inside yourself and understanding who you are with respect to the natural world and how you approach the gardening process.

　　?__2__

　　Some people may think that a garden is no more than plants, flowers, patterns and masses of color.Others are concerned about using gardening methods that require less water and fewer fertilizers(肥料)．__3__．However, there are a number of other reasons that might explain why you want to garden.One of them comes from our earliest years.

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