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问题 单项选择题

下列句子属于反问句的一项是（）

A．你这种做法难道是正确的吗

B．请问去市政府该怎么走

C．广场上的垃圾怎么这样多啊!

D．你应该考虑一下自己的做法是否正确。

答案

参考答案：A

单项选择题 A1/A2型题

胆红素是下列哪种物质的分解产物（）

A.胆汁酸

B.胆素原

C.胆素

D.血红素

E.胆固醇
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单项选择题

In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key.

（73）是（）

A.free

B.freely

C.locally

D.partly
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