Investigators don’t ______ how many phytochemicals exist and how they work.

填空题Researchers say that supplements can completely take the place of real food in the near future.

填空题It is proved that the uncontrolled activity of free radicals caused many cancers.

填空题The author suggested that people should eat more fruits, vegetables, and plant-based foods, eat less high-fat, high- calorie foods with insufficient nutritional value, stop smoking, exercise often and control their weight in order to reduce cancer.

填空题According to this passage, a diet high iii plant-based foods plays an important role in fighting all kinds of diseases.

问答题1. Energy crisis is one of the main problems facing the world today.2. Importance of energy.3. Conserving energy.

单项选择题Which of the following conclusions is best supported by the second paragraph

单项选择题In order to enable the intelligent robot to deal with an unexpected situation, the computers in it must do the following things except ______ .

单项选择题From the third paragraph, we can know that ______ .

单项选择题According to the passage, why has human intelligence not been copied in the making of a robot

单项选择题According to the passage, however intelligent a robot may be, it ______ .