It is thought that one billion people I the world,  _____is half the word’s workers, earn their living by farming.
A．ifB．thatC．whichD．what
B
句中“half the world’s workers”是對(duì)“one billion people in the world” 的補(bǔ)充說明， “that is”是 “that is to say”的省略說法，是插入語(yǔ)，that 并不是引導(dǎo)非限制性定語(yǔ)從句的，如果在 “that is”后加個(gè)逗號(hào)則更清楚，應(yīng)選B。
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