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问题 单项选择题

有三句话：（1）“孩子要吃饭”，（2）“孩子要吃的”，（3）“孩子要了一碗饭”中的三个“要”分别是（）。

A、动词、动词、助动词

B、助动词、动词、动词

C、动词、助动词、动词

D、助动词、助动词、动词

答案

参考答案：B

单项选择题

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
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单项选择题

现阶段，干细胞主要被用于（）的研究。

A、治疗性

B、繁殖性

C、传播性

D、生物性
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