问题
选择题
We are not allowed _____ outdoors with some other children. [ ]
A. playing
B. to be playing
C. to play
D. be playing
答案
答案：C
搜题请搜索小程序“爱下问搜题”
We are not allowed _____ outdoors with some other children. [ ]
A. playing
B. to be playing
C. to play
D. be playing
答案：C
仔细观察下页图，并结合所学知识回答下列问题。
 | |
| 图一 |  |
| 图二 |
（1）图一中的人物是谁？旁边是他的什么发明？这个发明使人类进入了什么时代？