A、They occurred in equal numbers in all biogeographical regions.
B、They were mostly found in insects and reptiles.
C、They were likely to be in tropical rather than temperate regions.
D、Both B and C.
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正确答案
试题解析
解析:短文的第二段第二句描述的是科学家目前的研究结果,第三段描述的是科学家在这之前对于cryptic species的理解。本题用的是过去式,问的是过去的状况,因此答案在第三段中,B和C均是答案,所以D是正确选择。