According to the last paragraph, which of the following statements is true?
A．Genetically modified foods have been supervised by the authority.
B．Genetically modified foods have proved to be safe.
C．The nonengineered foods absolutely can be contaminated by the engineered foods.
D．The engineered foods are immediately profitable for the food companies.

未分类题By saying that 'London has 32 library authorities but just one police authority,' Desmond Clarke means that______.A．the management of London's police system is less professional than that of London's library systemB．the supervision system of London's libraries is more complete than that of London's police systemC．the organizational structure of London's libraries is more complicated than it is necessaryD．the organizational structure of London's libraries is superior to that of London's police system

未分类题现金流量主要由以下几个部分构成()。

未分类题The word 'stagnate' in Paragraph 3 probably means______.A．deterioratingB．indebtingC．flourishingD．stopping developing or advancing

判断题证券投资收益的最大化和投资风险的最小化这两个目标往往是矛盾的。()

未分类题From the first two paragraphs, we learn that______.A．aging brains tend to process more information simultaneouslyB．one becomes forgetful when he gets oldC．older people don't think their brainpower is decliningD．the aged always stress long-term benefit