【单选题】Some of the engines were not suitable for the work they were ________ for.
【多选题】在发送电子邮件时,下列说法不正确的是( )
【单选题】在互联网上发送电子邮件时,下列说法不正确的是
【简答题】Some criminals were printing ________ dollar bills until they were arrested. A) decent B) fake C) patent D) suspicious
【单选题】在互联网上发送电子邮件时,下列说法不正确的是
【单选题】Some rural African were infected with AIDS because they were given injections of Koprowski's vaccine.