Last week the students did the experiment in order to_______ if iron rusts in dry air．
A．look forB．look atC．find outD．find
C
短語辨析.   A. 尋找 B. 看   C.找出;查明 D. 發(fā)現(xiàn).句意:為了查明鐵是否在空氣中生銹,上周這些學生們做了這個實驗.選C.
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