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 Boyles 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.
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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