题目内容

数字认证中心，简称CA机构，又称证书认证中心，是承担网上认证服务，能够签发数字证书并能确认用户身份的受大家信任的第三方机构。

A. 对
B. 错

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公钥基础设施（Public Key Infrastructure，PKI）是一个用非对称密码算法原理和技术来实现并提供安全服务的具有通用性的安全基础设施。

A. 对
B. 错

You can always rely ________ Peter to be on time for meetings.

A. around
B. on
C. at
D. of

I think you’re capable ________ getting really good grades if you work hard.

A. of
B. by
C. in
D. over

Seeing the car accident had a huge ________ on the rest of his life.

A. enough
B. effort
C. effect
D. explain