According to the passage, however intelligent a robot may be, it ______ .

单项选择题According to the author, ______ .

单项选择题The author mentions that the maximum THR for older adult participants in sports should be less than ______ beats per minute.

单项选择题According to the passage ,all of the following are advisable to older adults for a fitness program except

单项选择题The last word of the passage addictive means ______ .

单项选择题The passage is a piece of ______ .