Even today press agencies still sometimes use carder pigeons to send messages between offices inlarge cities because the pigeons are not ______.
举一反三
- Even today a water engineering project is still hard to build because _______.
- Pigeons can carry messages for about _____. A: two weeks B: four weeks C: two years D: four years
- We use the robot in the operation because _________. A: it can send messages in a high speed B: even a top doctor can’t do the operation himself C: it can make the operation safer and better D: operations can be done without and doctors.
- What is the author' s purpose in writing this passage A: To call on the readers to protect homing pigeons from extinction. B: To offer the reader information about homings pigeons and their training. C: To appeal to the owners of homing pigeons to set the birds free. D: To convince the reader it worthwhile to keep a homing pigeon as pet.
- Which statement is right： A: Both message queue and unnamed pipe can send/receive messages between any two processes. B: Both message queue and unnamed pipe can send /receive messages with the specified type. C: Both message queue and named pipe can send/receive messages between any two processes. D: Both message queue and named pipe can send /receive messages with the specified type.