单项选择题

Less developed countries ______.

A．spend little on research
B．realize that progress depends on basic research
C．encourage their career scientists to experiment
D．devote less than 7% of their scientific budget to basic research

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热门试题

单项选择题

Although we all depend on the resources of nature for our survival, ______.

A．industrial products are replacing all our natural resources
B．it is only on islands that nature survives
C．we have forgotten what our original countryside looked like
D．we have allowed large areas of countryside to be spoilt by industrial development

单项选择题

Recent studies by the Council of Europe show that ______.

A．it is only in Britain that wildlife needs more protection
B．certain species of reptiles and butterflies in Europe need protecting
C．there are fewer species of reptiles and butterflies in Europe than elsewhere
D．all species of wildlife in Europe are in danger of dying out