there, the southwest desert contains a remarkable variety of plants.
A. Rarely as it rains
B. Sometimes it rains
C. It rarely rains
D. Although rarely rains
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(答案→)A. Rarely as it rains
B. Sometimes it rains
C. It rarely rains
D. Although rarely rains
解析：as“虽然”连接状语从句倒装。 虽然很少下雨但是西南沙漠地区却有许多奇异的植物。