You: Yes, it’s indeed a very good reference book. I don’t know how I shall express 3.（）.

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• Which of the following could be a reference group for an individual？
• The body part of a business letter usually begins with reference to the previous letter received。
• Leave the reference books behind, __________ you wont be able to think independently.
• A digital camera provides a quick and easy means to （）ideas for later reference.
• Experience will be valuable reference as well as ability to polished doctors’ communication skill naturally.