题目选项分析

Like those of the African white and black rhinos, the Sumatran rhino has two horns, but the front one is generally less than a foot long and the second is so small that it often appears to be missing.

Like the African white and black rhinos, the Sumatran rhino has two horns, but the front one is generally less than a foot long and the second is so small that it often appears to be missing.