The average life span for Americans is now ________________.

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• 1、Life insurance is financial protection for dependents against loss ______ of the bread-win
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• 2、The greatest challenge for the Americans is understanding the ________ of Eastern Eu
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• 3、The average life expectancy of ancient Egyptians is about ______.A．32B．37C．50D．60
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• 4、For three quarters of its span on Earth life______almost exclusively as microorganisms.A．
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• 5、It is common practice now ________ the web for resources and information for homework.
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• 6、The ______ of the life－raft is sufficient for all of you.
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