Why does David think he might retire early?
A. Because you have to be young to write computer programs.
Because he wants to stop working when he is a millionaire.
C. Because he thinks computer games might not always sell so well.
D. Because he thinks his firm might go bankrupt.
下面四种内排序方法中,要求内存容量最大的是()
A. 插入排序
B. 选择排序
C. 快速排序
D. 归并排序
When the Red Cross started blood banks ______ .
A. white Americans would not give their blood
B. black Americans were unwilling to give their blood
C. no one was able to give his blood
D. both the white and the black gave blood