He spent almost all his money to buy the hen which was said to be able to lay gold eggs, ______(没想到这只鸡根本不会下蛋).

A. the writer himself is homeless, even in his eighties
B. many older homeless residents are going on strike in 25 cities
C. there is a serious shortage of academic facilities
D. homeless children are denied the opportunity of receiving free education

A. There exists thousands of species of animals in the world.
B. Man came to establish a close relationship with a number of animals.
C. In some regions a donkey seems to be a very useful beast.
D. An animal will be useless unless domesticated.