题目

 The idea for the new plan came to his mind, ______ to his experiment in the lab. A. while devoting                                             B. while devoting himself  C. while he was devoted                                    D. while devoted 答案：C9．根据如图的是一体，回答问题（1）图的[1]是受精过程，对照图中父母细胞把图中的精子、卵细胞和受精卵补画完整（包括细胞内字母标号）．（2）图中“”代表染色体，A和a所指部分代表基因．（3）人体的正常受精卵中含有46条染色体，母亲的染色体组成23对+XX．