解放思想、实事求是的思想路线，是建设有中国特色社会主义的首要问题。 ( )
参考答案：错
1. Don't let him (go) there alone.
2. Have you finished (read) the book?
3. All the students are busy (clean) the room.
4. Did you hear the baby (cry) in the next room?
5. Jack went to school without (take) his backpack.
针对不同的传输介质，Ethernet网卡提供了相应的接口，其中适用于非屏蔽双绞线的网卡应提供( )。
A．AUI接
B．BNC接口
C．RS-232接121
D．RJ-45接口
All the students are busy (clean) the room.