[单项选择]（） is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
A. It is the sun and not the earth
B. Being the sun and not the earth
C. The sun and not the earth
D. That the sun and not the earth

[单项选择]（）the center of our planetary system was considered as heresy by the church in the Middle Ages.
A. It is the sun and not the earth is
B. That the sun and not the earth is
C. Being the sun and not the earth is
D. The sun and not the earth is

[单项选择]（）is the center of our planetary system was a difficult concept to grasp in the Middle Ages.
A. It is the sun and not the earth
B. Being the sun and not the earth
C. The sun and not the earth
D. That the sun and not the earth

[单项选择]（　） is the center of our planetary system was a difficult concept to grasp in the Middle Age.
A. It is the sun and not the earth
B. Being the sun and not the earth
C. The sun and not the earth
D. That the sun and not the earth

[单项选择]______ is the center of our planetary system was considered as heresy by the church in the Middle Ages.
A. It is the sun and not the earth
B. That the sun and not the earth
C. Being the sun and not the earth
D. The sun and not the earth

[单项选择]_______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.
A. It is the sun and not the earth
B. Being the sun and not the earth
C. The sun and not the earth
D. That the sun and not the earth

[单项选择]______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.
A. It is the sun and not the earth
B. Being the sun and not the earth
C. The sun and not the earth
D. That the sun and not the earth

[单项选择]

Although our educational system and our society generally place a high value on competition, some problems can be better solved through cooperation and some forms of learning are strengthened through cooperation. Both competition and cooperation have a place in society and can serve a useful purpose. Consequently, it is necessary to be able to engage in both processes depending on the circumstances and one’s goals.
In the academic environment grades are often conceived as the major criterion (标准) for the assessment of learning. We tend to assume that the higher one’s grade average, the more one has learned, thus creating greater competition for grades. This competition can be particularly intense in fields where the financial rewards are great and opportunity is limited: law, engineering, medicine, and business.
However, the measure of one’s learning is not limited to grades. It is possible to learn a great deal about a subject and receive a low
A. Cooperation.
B. Competition.
C. Evaluation.
D. Teaching process.