搜题请搜索小程序“爱下问搜题”
问题 单项选择题

中国早期智人生活的年代是：（）

A.距今10万年-20万年之间

B.距今20万年-40万年之间

C.距今60万年-80万年之间

D.距今100万年-150万年之间

答案

参考答案：A

选择题

某学生在显微镜下观察自制的叶肉细胞装片时，在视野中发现一部分细胞看得清晰，而另一部分细胞则较模糊，这是由于[ ]

A．反光镜未调好

B．标本厚薄不均

C．细准焦螺旋未调好

D．物镜已坏
查看答案
填空题
用方框中所给词的适当形式填空
run, play, lie, look, imagine, climb, get off, draw, take  off, visit
 
1. The cat was so scared that it _________ up the tree quickly.
2. I can't wait. When can our plane _________?
3. We are going to _________ the old people's house this weekend.
4. When Tony called me yesterday, you can't _________ how surprised I was!
5. The boys _________ soccer when it began to rain.
6. The dog _________ down the street when we found it.
7. At the last bus stop, all the people _________ the bus. So there was no one left on the bus.
8. While we were _________ at Dave's photos, we heard a loud noise in the street.
9. The teacher found a book _________ on the floor when he came into the classroom.
10. The old man is interested in _________ pictures when he is free.
查看答案