Camera-based gait recognition fails to come into wide use, because ______.
a. it’s not easy to find the cameras
b. finger print recognition is still popular
c. sometimes the cameras can be covered
d. it’s a waste of money to fix the equipment
e. good lighting conditions can’t be guaranteed
f. it’s difficult to set up the system

(单选题)To deal with the problem in recent years, exchange programme (单选题)Vickie Weiner is the person who ______. (单选题)According to the text, why was it easier to find host famili (单选题)What should be the best title for the text? (单选题)According to Drkyriazis, which of the following may be “good (单选题)What does the underlined word “it” in Paragraph 3 refer to? (单选题)What is Dr Kyriazis’ opinion probably based on? (单选题)From the passage, we learn that the author ______ comparison (单选题)The author presents the phenomenon of the comparison by ____ (单选题)According to the author, why would people like to post wonde