The branch of linguistics which studies the characteristics of speech sounds and provides methods for their description, classification and transcription is called().

单项选择题According to the passage, it can be deduced that().

A. in the future DNA technology will dominate the industry and agriculture
B. in the future DNA technology will disappear from the world
C. in the future DNA technology will be a dilemma in a long time
D. in the future the human beings derived from the DNA technology will take over the earth

单项选择题According to the passage, which of the following categories of travellers will gainmost from airline alliances().

A. Travellers who fly frequently economy class.
B. Travellers who fly frequently business class.
C. Travellers who fly occasionally during holidays.
D. Travellers who fly economy class once.in a while.