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Both scientists warned that global warming could____________(妨碍臭氧空洞的修复), which is about the size of the North American continent.
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Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： Do you have a tough math test coming up？ Then listen to some classical piano music just before the test. You might end up with a higher score. Researchers at a university in California conducted an experiment. They asked a group of college students to listen to some piano music by a famous 18th century composer before taking a math test. They were surprised to find that the students' scores jumped g to 9 points. The music seems to excite nerve activities in the brain: similar to the activity that occurs when a person is figuring out a math problem. However, the scientists warn before you get too excited about applying this method to your ninth test, you should remember that brain exciting effects last only 10 or 15 minutes. Would rock music work as well as the piano music did？ "No", the scientists say. In fact, the less complex music might even interfere with the brains' reasoning ability.
(27)
A．The difference between classical music and rock music.
B．Why classical music is popular with math students.
C．The effects of music on the results of math tests.
D．How to improve your reasoning ability.
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： Do you have a tough math test coming up？ Then listen to some classical piano music just before the test. You might come up with a higher score. Researchers at a university in California conducted an experiment. They asked a group of college students to listen to some piano music by a famous 18th century composer before taking a math test. They were surprised to find that the students' scores jumped 8 to 9 points. The music seems to excite nerve activities in the brain; similar to the activity that occurs when a person is figuring out a math problem. However, the scientists warn before you get too excited about applying this method to your math test, you should remember that brain exciting effects last only 10 or 15 minutes. Would rock music work as well as the piano music did？ No, the scientists say. In fact, the less complex music might even interfere with the brain's reasoning ability.
(27)
A．The difference between classical music and rock music.
B．Why classical music is popular with math students.
C．The effects of music on the results of math tests.
D．How to improve your reasoning ability.
A.Animals are very skillful at a circus．
B.They are big and strong．
C.Some animals are as clever as human beings．
D.Animals can be trained because they like to get something as a reward．
A．To warn students not to hang laundry outdoors
B．To find out if the students wash their own clothes
C．To illustrate the same phenomenon in a different way
D．To point out a mystery that scientists cannot explain
A．They both attract scientists' attention.
B．They can both be quite challenging.
C．They are both thought-provoking.
D．They may lead to surprising findings.
A．They both attract scientists' attention.
B．They can both be quite challenging.
C．They are both thought-provoking.
D．They can both lead to surprising findings.
A．may be something beneficial to human beings
B．should be addressed by environmental scientists
C．has ignited a heated controversy among scientists
D．is important both statistically and environmentally
______, some famous scientists have the qualities of being both careful and careless.
A．Strangely enough
B．Enough strangely
C．Strange enough
D．Enough strange
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： (26)Scientists claim that air pollution causes a decline in the world's average air temperature. In order to prove that theory, ecologists have turned to historical data in relation to especially huge volcanic eruptions. They suspect that volcanoes effect weather changes that are similar to air pollution.
One source of information is the effect of the eruption of Tambora, a volcano in Sumbawa, the Dutch East Indies the former name of the Republic of Indonesia in April 1815. The largest recorded volcanic eruption, (27)Tombora threw 150 million tons of fine ash into the sky. The ash from a volcano spreads worldwide in a few days and remains in the air for years. Its effect is to turn incoming solar radiation into space and thus cool the earth. For example, records of weather in England show that between April and November 1815, the average temperature had fallen 4.5F. During the next twenty-four months, England suffered one of the coldest periods of its history. Farmers' records from April 1815 to December 1818 indicate frost throughout the spring and summer and sharp decreases in crop and livestock markets. (28)Since there was a time lag of several years between cause and effect, by the time the world agricultural commodity community had deteriorated, no one realized the cause.
Ecologists today warn that we face a twofold menace. The ever-present possibility of volcanic eruption, such as that of Mt. St. Helens in Washington, added to man's pollution of the atmosphere with oil, gas, coal, and other polluting substances, may bring us increasingly colder weather.
(27)
A．They were evident in the decreased world temperature.
B．They were of several days' duration worldwide.
C．They were felt mainly in the Dutch East Indies.
D．They were immediately evident to the world's scientists.
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