1. Ordinarily, gas molecules are so close that they attract one another for only a very short time.
2. The statement that atoms in the molecule H2O may be light or heavy is a sample of quantitative laws.
3. Human law is similar to natural law in essence.
4. Charles law and Boyle s law are based on observations made at ordinary temperatures and pressures.
5. Since cell-division is sometimes irregular and certain types die off early, we sometimes get neither 3 : 1 ratio nor 1 : 1 ratio.
6. Differences in relative fitness are more frequent than irregular cell-division.
7. We must see many human beings before stating the rule that all men have 2 ears.
8. Compared with human laws, laws of nature are accurate because they are expressed in the form of_______.
9. In considering the movements of stars, scientists need not consider their_______.
10. _______laws can serve as good guides.
参考答案:
I. Y 2. Y 3. N 4. N 5. Y 6. NG 7. N 8. approximation 9. distance 10. Qualitative
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