Our professor told us that salt water _____ at a lower temperature than fresh water.
A．is freezingB．was frozenC．freezesD．froze
C
考查時(shí)態(tài)，句意：我們的教授告訴我們鹽水和淡水相比在非常低的溫度下會結(jié)冰。根據(jù)語境，這是一種自然現(xiàn)象，所以應(yīng)用一般現(xiàn)在時(shí)態(tài)。選C。
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