大全第14篇文章求教.谢谢

ziyumba

请问sc大全第十四篇将胚胎和基因的题目中第二: it can be inferred from the passage that the morphogenetic present in the early embryo are? 问什么选e

                    第三题：the main topic of the passage 为什么选d而不是c?

谢谢赐教！

panda