单选题 A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in {{U}}(67) {{/U}} at the Sun's very center. It is here that is to be found the {{U}}(68) {{/U}} of the energy that the Sun pours out into space is {{U}}(69) {{/U}} The energy takes the form of light and heat. This energy is {{U}}(70) {{/U}} at the center of the Sun as billions {{U}}(71) {{/U}} billions of nuclei of hydrogen atoms {{U}}(72) {{/U}} with each other and fuse together to form nuclei of helium, and in doing so, {{U}}(73) {{/U}} some of the energy that is {{U}}(74) {{/U}} in the nuclei of atoms. The {{U}}(75) {{/U}} of light and heat of the Sun {{U}}(76) {{/U}} that some 600 million tons of hydrogen be {{U}}(77) {{/U}} into helium (氦) in the Sun every second. This the Sun has been doing for several thousands of millions of years. The nuclear energy is released at the Sun's center as high-energy gamma radiation, {{U}}(78) {{/U}} of electromagnetic radiation like light and radio waves, only of very much shorter {{U}}(79) {{/U}}. This gamma radiation is absorbed by atoms inside the Sun to be {{U}}(80) {{/U}} at slightly longer wavelengths. This radiation, in its {{U}}(81) {{/U}} is absorbed and reemitted. As the energy filters through the {{U}}(82) {{/U}}of the solar interior, it passes through the X-ray part of the spectrum {{U}}(83) {{/U}} becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small {{U}}(84) {{/U}} of the Sun's light and heat is emitted in such directions that {{U}}(85) {{/U}} passing unhindered through interplanetary space, it {{U}}(86) {{/U}} the Earth.

单选题Because he is busy making money now, he is ______ of new developments in his original field.

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

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单选题In ______ to his brother, he was always considerate in his treatment of others

单选题Questions 16 to 18 are based on the passage you have just heard.

单选题Directions: In this section, you will hear 8 short conversations" and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.

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单选题 {{B}}Questions 23 to 25 are based on the conversation you have just heard.{{/B}}

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单选题Questions 12 to 15 are based on the conversation you have just heard.

单选题Questions 22 to 25 are based oil the conversation yon have just heard.

单选题The little girl was so frightened that she just wouldn't ______ her grip on my arm.A) loosenB) removeC) relieveD) dismiss

单选题The troops were called out to _________ the disturbance.

单选题Questions 22 to 25 are based on the passage you have just heard.

单选题 Questions 22 to 25 are based on the conversation you have just heard.

单选题[此试题无题干]