依据有无细胞核,生命世界区分为原核生物和真核生物。
参考答案:对
请根据光的反射定律,在下图中画出入射光线AO,并标出入射角及其度数.
根据括号中的词语提示完成句子
1. Is she still reading the newspaper? (I'll ask her.)
I'll ask her________________the newspaper.
2. Will he join us or not?(I don't know.)
I don't know________________.
3. Why didn't you come here? (She asked me.)
She asked me________________.
4. How can I get to the bus stop?(please tell me.)
Please tell me______________the bus stop.
5. How often do you go to Beijing?(Can you tell me?)
Can you tell me_________________?