单项选择题
Confirming reception of the sent messages means()
A.the messages are sent to right receiversB.the messages are correctly understoodC.the messages are correctly understood by right receivers
单项选择题 The city has a population of over 30 million,most of them()in the countryside.
判断题 An inadequate knowledge of grammar would severely constrain one’s capacity for effective communication.()
单项选择题 titanic()