问题
选择题
When Miss Green began to something, the children stopped and became quiet. [ ]
A. speak; telling
B. tell; speaking
C. talk; saying
D. say; talking
答案
答案：D
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When Miss Green began to something, the children stopped and became quiet. [ ]
A. speak; telling
B. tell; speaking
C. talk; saying
D. say; talking
答案：D
计算并填写下表
| IP地址 | 121.209.33.90 |
| 子网掩码 | 255.240.0.0 |
| 地址类别 | (41) |
| 网络地址 | (42) |
| 直接广播地址 | (43) |
| 受限广播地址 | (44) |
| 子网内最后一个可用IP地址 | (45) |
45（）