38岁女性，洗衣时突发右侧肢体活动不灵，查体：意识清，失语，二尖瓣区可闻双期杂音，心律不齐，右侧偏瘫，上肢重于下肢，偏身痛觉减退，首先考虑的诊断（）。

A.脑血栓形成

B.脑栓塞

C.脑出血

D.蛛网膜下隙出血

E.短暂脑缺血发作

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. There are two types of key technology: private key and public key. Private-key encryption methods are called (71) ciphers, information is encrypted with (72) both the sender and receiver hold privately. Public-key encryption methods are called (73) ciphers, (74) created for each user, encryption key and deception key are (75)

A．synchronous

B．Asynchronous

C．symmetric

D．asymmetric