問題詳情

15. The technology, developed in coal-rich Germany in the 1920s, involves partly burning coalto turn it into a gas, then using a catalyst, usually a metal, make it a liquid.
(A) coal-rich
(B) involves partly
(C) turn it into
(D) make it

參考答案

答案:D
難度:非常困難0
統計:A(0),B(0),C(0),D(0),E(0)

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