男性，20岁，发现高血压2年，血压在（180～220）／（110～130）mmHg，尿蛋白（++），尿素氮11.5mmol/L，血肌酐5mg／L，心电图示左室肥厚劳损，最可能的诊断是（）

A.高血压病3级

B.肾性高血压

C.高血压危象

D.高血压病1级

E.急进性高血压

The major problem with E-mail is that it is (71) easy to use that people can become (72) with messages (73) they can possibly answer in a day. In addition, mail boxes require some management to (74) messages or archive those that might be required later. Senders don’t always know about your E-mail backlog and often send (75) messages.

A．too many

B．redundant

C．long

D．trivial