对细菌进行染色时，染色剂着色的部位是（）。
A、细胞壁
B、细胞膜
C、细胞核
D、细胞壁和细胞膜
参考答案：B
根据句意，在每个句子的空白处填入一个适当的词，使句子意思完整，语法正确。
1. Amy began ice skating _____ the age of four.
2. Liu Xiang was _____ in 1983 in Shanghai.
3. Yesterday I did some morning exercises and _____ a little breakfast.
4. I stayed at home and _____ TV yesterday.
5. The boy _____ Li Ming is my friend.
妊娠期甲亢首选抗甲状腺激素药物
