单项选择题
What problem does Alberto say Brazil faces now（）
A．The lack of overall urban planning. B．The huge gap between the haves and have-nots. C．The inadequate supply of water and electricity. D．The shortage of hi-tech personnel.
单项选择题 From the research conducted by the communications provider Inter-Tel, we learn that（） .
单项选择题 What is Neil Stephenson’s advice to firms contracting internet services（）
单项选择题 What does the man say about some elderly people（）
