[单项选择]Why is it advised to buy a baby dog under three months old

[单项选择]Why is it advised to buy a baby dog under three months old

[多项选择]What are three common reasons why customers are saying that they need to evolve their data center?（　）
A. architectures that is inflexible and inefficient
B. desire to use the same vender for desktop and server deployments
C. selecting best-performing vendors for each individual component
D. existing equipment has reached and of life
E. increasing operational costs of managing data centers
F. demand among users for access to information anytime, anywhere

[多项选择]Which three challenges have been created by the move toward Virtualization in the data center? （）
A. overstaffing
B. management integration
C. coherent policies and security
D. scalability
E. consolidation
F. asset tracking

[单项选择]Why does the writer say a dog is a more demanding pet than a cat

[单项选择]Why do most intelligence tests combine all three types of questions in equal numbers

[单项选择]Why was it possible for these ancient trees let more light through than modern ones
A. Because they were closely spaced, only 3 to 16 feet apart.
B. Because they were smaller plants and shrubs.
C. Because their branches did not fan out as far as to form a shape like umbrella.
D. Because they had very small leaves like that of fern and dropped easily.

[单项选择]Why did Mr. Crane buy the field

[单项选择]According to the passage, why do people buy tickets to a concert

[单项选择]

WHY SHOULD anyone buy the latest volume in the ever-expanding Dictionary of National Biography I do not mean that it is bad, as the reviewers will agree. But it will cost you 65 pounds. And have you got the rest of volumes You need the basic 22 plus the largely decennial supplements to bring the total to 31. Of course, it will be answered, public and academic libraries will want the new volume. After all, it adds 1,068 lives of people who escaped the net of the original compilers. Yet in 10 years' time a revised version of the whole caboodle, called the New Dictionary of National Biography, will be published. Its editor, Professor Colin Matthew, tells me that he will have room for about 50,000 lives, some 13,000 more than in the current DNB. This rather puts the 1,068 in Missing Persons in the shade.    　
When Dr Nicholls wrote to The Spectator in 1989 asking for names of people whom readers had looked up in the DNB and had been disappointed not to find
A. because it is not worth the price.
B. because it has fewer entries than before.
C. unless one has all the volumes in his collection.
D. unless an expanded DNB will come out shortly.