Optimism is a good characteristic, but if carried to an excess it becomes foolishness.该句属于哪种句子结构类型：
举一反三
- Of all the changes that have taken place in English-language newspapers during the past quarter-century, perhaps the most far-reaching has been the inexorable decline in the scope and seriousness of their arts coverage.该句属于哪种句子结构类型：
- New sources of energy must be found, and this will take time, but it is not likely to result in any situation that will ever restore that sense of cheap and plentiful energy we have had in the times past. 该句属于哪种句子结构类型：
- 从句子结构分，句子可以分为（）句和（）句。
- When the price of a good is held under the equilibrium price, the result will be A: Excess demand B: Excess supply C: A surplus of the good D: neither surplus nor shortage of the good
- Which is the main characteristic of a good conclusion?