23. If productivity measures the efficiency of an economy, a measure of what an economic system produces is its gross national product , which is the current market value of all final goods and services that a nation produces within a particular period.
新GRE作文范文是考生们备考新GRE写作的题库,多多背诵一些范文,学习里面的经典句式运用到自己的写作当中,肯定会为自己的GRE考试增分的。
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