GRE Reading Comprehension: ETS-GRE阅读ETS - 9V555N447M0X2ALA7

According to the passage, which of the following is true of Lymnaea peregra? A. Handedness within the species was at one time equally distributed between left and right. B. Under laboratory conditions, dextral eggs from Lymnaea peregra can be artificially induced to develop into sinistral snails. C. Broods of Lymnaea peregra are, without variation, exclusively sinistral or dextral. D. Handedness in Lymnaea peregra offspring is determined by two parents together. E. fewer sinistral offspring in dextral broods than dextral offspring in sinistral broods