[单项选择]In parts of the Arctic, the land grades into the landfast ice so ______ that you can walk off the coast and not know you are over the hidden sea.
A. permanently
B. imperceptibly
C. irregularly
D. precariously

[单项选择]In parts of the Arctic, the land grades into the landfast ice so ______ that you can walk off the coast and not know you are over the hidden sea.
A. permanently
B. imperceptibly
C. irregularly
D. precariously

[单项选择]In Ireland and Scottish Highlands land enclosure led to mass emigration,particularly to（）
A. Africa
B. Eastern Europe
C. Asia
D. The New World

[单项选择]The Arctic fox is found throughout the Arctic, usually on tundra or mountains ______ the sea.
A. (by which near
B. ( near of
C. ( because near
D. ( near

[单项选择]Much of northern Canada lies within the Arctic Circle, and ______ ice or the sparse vegetation known as tundra.
A. ( it is permanently covered by
B. ( by permanently it is covered
C. ( is permanently covered by it
D. ( it is covered by permanently

[单项选择]

Is there enough oil beneath the Arctic National Wildlife Refuge (保护区) (ANWR) to help secure America’s energy future President Bush certainly thinks so. He has argued that tapping ANWR’s oil would help ease California’s electricity crisis and provide a major boost to the country’s energy independence. But no one knows for sure how much crude oil lies buried beneath the frozen earth, with the last government survey, conducted in 1998,projecting output anywhere from 3 billion to 16 billion barrels.
The oil industry goes with the high end of the range, which could equal as much as 10% of U.S. consumption for as long as six years. By pumping more than 1 million barrels a day from the reserve for the next two to three decades, lobbyists claim, the nation could cut back on imports equivalent to all shipments to the U. S. from Saudi Arabia. Sounds good. An oil boom would also mean a multibillion-dollar windfall (意外之财) in tax revenues, royalties (开采权使用费) a
A. It will exhaust the nation's oil reserves.
B. It will help secure the future of ANWR.
C. It will help reduce the nation's oil imports.
D. It will increase America's energy consumption.

[单项选择]The Eskimos are able to live in Arctic regions because ______.
A. they can endure severe living conditions
B. they are strong and energetic
C. food is abundant there
D. they have ways to protect themselves from cold

[单项选择]His superior grades at high school enabled him to enrol at the tuition-free College of the City of New York.
A. 他的上级在高中期间学习时与他同级，所以有资格推荐他免考进入了纽约市一所大学。
B. 他的上级在高中期间的学习成绩很优异，担保他自由进入了纽约市立大学。
C. 由于在高中成绩显著，他参军后，免费进入了纽约市一所大学。
D. 由于在高中成绩优异，他进入了免费的纽约市立大学。

[单项选择]Exams, grades and marks should be abolished because children' s progress should be estimated only by ______ .
A. educated persons
B. the children themselves
C. teachers
D. parents

[单项选择]All of a sudden, a blizzard from the Arctic swept through the now______ streets.
A. lessened
B. deserted
C. neglected
D. insulated

[单项选择] The STUDENT_GRADES table has these columns STUDENT_ID NUMBER(12) SEMESTER_END DATE GPA NUMBER(4,3) Which statement finds students who have a grade point average (GPA) greater than 3.0 for the calendar year 2001?（）
A. SELECT student_id, gpa FROM student_grades WHERE semester_end BETWEEN '01-JAN-2001' AND '31-DEC-2001' OR gpa > 3.;
B. SELECT student_id, gpa FROM student_grades WHERE semester_end BETWEEN '01-JAN-2001' AND '31-DEC-2001' AND gpa gt 3.0;
C. SELECT student_id, gpa FROM student_grades WHERE semester_end BETWEEN '01-JAN-2001' AND '31-DEC-2001' AND gpa > 3.0;
D. SELECT student_id, gpa FROM student_grades WHERE semester_end > '01-JAN-2001' OR semester_end < '31-DEC-2001' AND gpa >=s 3.0;

[单项选择]What's the weather like in the Arctic region of European Russia more than 30,000 years ago
A. Moderate temperature, relatively dry and ice-free.
B. Extremely cold, relatively dry and ice-free.
C. Extremely cold, plenty of raining and ice free.
D. Extremely cold, relatively dry and ice frosted.

[单项选择]What' s the weather like in the Arctic region of European Russia more than 30,000 years ago
A. Moderate temperature, relatively dry and ice -free.
B. Extremely cold, relatively dry and ice- free.
C. Extremely cold, plenty of raining and ice- free.
D. Extremely cold, relatively dry and ice frosted.

[单项选择]Exams, grades, and marks should be abolished because children's progress should only be estimated by ______.
A. educated persons
B. the children themselves
C. teachers
D. parents