Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. (1) The protozoans, minute, aquatic creatures each of which consists of a single cell of protoplasm, constitute a classification of the most primitive forms of animal life. They are fantastically diverse, but three major groups may be identified on the basis of their motility. The Mastigophora have one or more long tails, which...
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Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.
(1) The protozoans, minute, aquatic creatures each of which consists of a single cell of protoplasm, constitute a classification of the most primitive forms of animal life. They are fantastically diverse, but three major groups may be identified on the basis of their motility. The Mastigophora have one or more long tails, which they use to project themselves forward. The Ciliata, which use the same basic means for locomotion as the Mastigophora, have a larger number of short tails. The Sarcodina, which include amoebae, float or row themselves about on their crusted bodies.
(2) In addition to their form of movement, several other features discriminate among the three groups of protozoans. For example, at least two nuclei per cell have been identified in the Ciliata, usually a large nucleus that regulates growth but decomposes during reproduction, and a smaller one that contains the genetic code necessary to generate the large nucleus.
(3) Protozoans are considered animals because, unlike pigmented plants to which some protozoans are otherwise almost identical, they do not live on simple organic compounds. Their cell demonstrates all of the major characteristics of the cells of higher animals.
(4) Many species of protozoans collect into colonies, physically connected to each other and responding uniformly to outside stimulate. Current research into this phenomenon, along with investigations carried out with advanced microscopes may necessitate a redefinition of what constitutes protozoans, even calling into question the basic premise that they have only one cell. Nevertheless, with the current data available, almost 40,000 species of protozoans have been identified. No doubt, as the technology improves our methods of observation, better models of classification will be proposed.
What is protoplasm?
(A) A class of protozoan
(B) The substance that forms the cell of a protozoan
(C) A primitive animal similar to a protozoan
(D) An animal that developed from a protozoan
1 Air taxis:
A They can be a good solution to traffic congestion.
D They can be autonomously controlled.
(Taxi trên không:
A Chúng có thể là một giải pháp tốt cho tắc nghẽn giao thông.
D Chúng có thể được điều khiển độc lập.)
2 Undergrounds:
B They stop using routine fuel.
E They provide intercity trips in extremely short time.
A They can be a good solution to traffic congestion.
D They can be autonomously controlled.
(Tàu điện ngầm:
B Chúng ngừng sử dụng nhiên liệu thông thường.
E Chúng cung cấp các chuyến đi liên tỉnh trong thời gian cực ngắn.
A Chúng có thể là một giải pháp tốt cho tắc nghẽn giao thông.
D Chúng có thể được điều khiển độc lập.)
3 Cars:
D They can be autonomously controlled.
C They travel on three-dimensional roads with great speed.
(Ô tô:
D Chúng có thể được điều khiển độc lập.
C Chúng di chuyển trên những con đường ba chiều với tốc độ lớn.)
- Fact relates to all three is “They can be autonomously controlled.”
(- Sự thật liên quan đến cả ba là “Chúng có thể được điều khiển tự động.”)