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问题 选择题

李东将鲫鱼的胸鳍剪掉，再把鲫鱼放入水中观察，发现鲫鱼仍可游泳，但行进路线异常，鱼体失去了平衡而侧翻，这说明胸鳍的作用主要是

A．保持身体平衡

B．产生前进动力

C．保持前进方向

D．控制鱼体沉浮

答案

答案：A

因为减去胸鳍的鲫鱼，在游泳时身体失去了平衡，说明胸鳍具有保持身体平衡的作用。

填空题

小明做除法时，把除数121看成11，结果商比原来大70，那么原来的除法算式中，被除数是（  ），商是（  ）。
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单项选择题

Most IP layer-based proxy mechanisms, such as network address translation (NAT), only support uni-directional proxy, from the internal network to external network (the Internet). The proxy establishes the communication channel by (86) IP addresses. The IP addresses must be (87) . These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels, such as, multimedia applications. IP layer-based proxy mechanisms need additional software (88) for each application that uses (89) channels. SOCKS identifies communication targets through domain names, overcoming the restriction of using private IP addresses. SOCKS can use domain names to establish communication between separate LANs, with (90) IP addresses.

A．manufacturing

B．manipulating

C．conduct

D．implement
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