单项选择题

What will be crucial to the economy of the cities in the twenty-first century

A．Services.
B．Intellectual property.
C．Telecommunications.
D．both A and B.
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单项选择题
What is the author's attitude towards the reconstruction of The Pentagon and the World Trade Centre
A．Supporting.
B．Critical.
C．Neutral.
D．Indifferent.
单项选择题
Why aren't monkeys and apes troubled by fleas Because ______.
A．the fleas, when fully developed, are not normally aware where the primates are
B．they do not mind the fleas
C．the harmful type of flea rarely gets onto them
D．the fleas' relationship with them is important biologically
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