The main topic of the passage is _____.
The main topic of the passage is \_\_\_\__.
过去
“当一位杰出的老科学家说什么是可能的时候，他差不多总是对的；但当他说什么是不可能的时候，他差不多总是错的。”这一名言的哲学意蕴是（ ）。
“当一位杰出的老科学家说什么是可能的时候，他差不多总是对的；但当他说什么是不可能的时候，他差不多总是错的。”这一名言的哲学意蕴是（ ）。
下列关于生产者物价指数（PPI）和消费者物价指数（CPI）的说法，正确的是（ ）。
下列关于生产者物价指数（PPI）和消费者物价指数（CPI）的说法，正确的是（ ）。
He would have played football but he _____ time.
He would have played football but he \_\_\_\__ time.
Only when we hurried to the airport _____ the flight was cancelled.
Only when we hurried to the airport \_\_\_\__ the flight was cancelled.
当代资本主义国家在经济调节机制变化的同时，经济危机形态也发生了变化，主要表现在（ ）。
当代资本主义国家在经济调节机制变化的同时，经济危机形态也发生了变化，主要表现在（ ）。
In the road accident the other day three people _____，including the driver.
In the road accident the other day three people \_\_\_\__，including the driver.
During the past ten years, there have been _____ changes in the country.
During the past ten years, there have been \_\_\_\__ changes in the country.