摘要：79．What is the author’s purpose in writing this passage? A．To remind people of the need of sustainable development B．To suggest ways of ensuring sustainable food production C．To advance new criteria for measuring farming progress D．To urge people to rethink what sustainable agriculture is． Section C Directions: Read the following text and choose the most suitable heading from A-- G for each paragraph． There are two examples that have been done for you．There is one extra heading which you do not need． Popular photography can properly be said to have started in 1888 with the introduction of the Kodak．The Kodak camera was the invention of an American, George Eastman ．Advertised as “the smallest, lightest and simplest of all Detective Cameras ( a popular term of the 1880’s for hand-held cameras), it was a simple wooden box．It was small and light enough to be held in the hands while in use．

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