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问题 多项选择题

鼓励幼儿自主选择（）、（）和（），支持幼儿主动地、创造性地开展游戏，充分体验游戏的快乐和满足。

A.玩具

B.游戏内容

C.伙伴

D.材料

E.参与活动

答案

参考答案：B, C, D

判断题

昆曲中丑的地位较高的一个表现是化妆时丑开脸之后其他行当才能化妆。
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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.

A. binarytext B. hypertext C. plaintext D. supertext
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