To reach Africa, we flew high mountains, deep valleys and great deserts(沙漠).
A.on, across, though
B.over, through, through
C.over, through, across
D.on, in, across
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C解析试题分析：介词辨析。Over越过（从空中）；through穿过（从内部穿过）；across从表面越过；on在..上面；in在…里面；句意：为了到达非洲，我们飞越高山，穿过峡谷，跨越沙漠。故C正确。考点：介词辨析点评：Over越过（从空中）；through穿过（从内部穿过）；across从表面越过；on在..上面；in在…里面；