(2空)To acquainted you __________ (to, with) our products, we are sending you __________ (by, un

A.下列各项,不属于实证表现的是()


B.Which of the following is the closest in meaning with "trade with" in paragraph 2


C.在操作系统中,用户在使用I/O设备时,通常采用()。


D.《战舰波将金号》是苏联导演爱森斯坦的代表作品。()