下列句中划线词语使用不当的一项是(        ) （2分）

A．我想，几乎在每一个人的童年和少年时期都有一些“隐秘的想望”。

B．春光明媚的时节，登上山顶眺望远方，让人有一种心旷神怡的感觉。

C．母亲只好绝处逢生，默默承受一切痛苦，不停去庙里烧香拜佛，希望改变命运。

D．邻居家的老爷爷经常摆弄花草，很有闲情逸致。

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 decryption key are (75)

A．a key

B．two keys

C．three keys

D．four keys