单选题[此试题无题干]

单选题Scientific research has revealed that throughout the animal world, communication is just as important as it is to human beings. Countless animals lack the(67) for human speech, yet they employ entirely different methods in order to communicate (68) each other. Some of the most dramatic examples of this are provided by birds. There are roughly 10 000 (69) of birds in the world, each of which has its own miraculous features. (70) you may live, you can see a great number of these feathered creatures and can (71) different and extraordinary properties. In addition to their flawless flight mechanisms, expertise (72) the routes and timing of migrations, and ability to build nests, their methods to communicate is (73) wonder. At critical times in birds' lives, their (74) of hearing becomes particularly important. Experiments have shown that in order for birds to learn the (75) song of their own species, they need an auditory feedback system. (76) this system, young birds learn to (77) the sounds they produce with the song they have memorized. If they were (78) , it wouldn't normally be (79) for them to recognize songs. Birds' extremely sensitive hearing functions perfectly. Clearly, if this sense failed to (80) properly, the bird would not be able to hear any sounds (81) Moreover, birds also produce (82) communications by their facial expressions, beak movements, feather ruffling, and (83) their wings. Although each species has its own body language, many different species (84) movements in the same way. Via facial expression, birds can (85) a variety of messages to those around them--negative feelings such as dislike and resentment, as well as (86) ones like pleasure, enthusiasm and curiosity.

单选题How do WHO experts react to this special case in Vietnam?

单选题{{B}}Passage One Questions 26 to 28 are based on the passage you have just heard.{{/B}}

单选题[此试题无题干]

单选题

单选题What is one of the consequences caused by the many claims of household products?

单选题Questions 1 and 2 will be based on the following news item.

单选题Passage Two Questions 29 to 32 are based on the passage you have just heard.

单选题________ the government agrees to give extra money, the theater will have to close.

单选题What can we infer from the text?

单选题It can be inferred from the second paragraph that ______.

单选题{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}}

单选题[此试题无题干]

单选题[此试题无题干]

单选题Passage One Questions 26 to 29 are based on the passage you have just heard.

单选题The proposal to lay a telegraph cable from Europe to America made oceanographic studies take on ______.