目前我国的A股、B股、基金均实行T+1交易制度，投资者不可以在同一个交易日内反向卖出已买入但未交收的证券。()
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【C5】______
A. up
B. at
C. for
D. down
The new trend in artificial intelligence research stems from ______.
A. the shift of the focus of study on the recognition of the shapes of objects
B. the belief that human intelligence cannot be duplicated with logical, step-to-step programs
C. the aspirations of scientists to duplicate the intelligence of a ten-month-old child
D. the efforts made by scientists in the study of the similarities between transistor and brain cells
保费自动垫缴条款是指保险合同生效满一定期限后,如果投保人不按期缴纳保险费,保险人自动以保单乡下积存的责任准备金垫缴保费。对于垫缴的保费投保人需偿还并支付利息。该条款是用于()。
A. 分期缴费的定期
B. 终身寿险
C. 两全保险
D. 都适用
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