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问题 填空题

已知l1：2x＋my＋1＝0与l2：y＝3x－1，若两直线平行，则m的值为________．

答案

－

由题意知，m≠0，则直线l1的方程为：

y＝－x－，

∴，解得m＝－．

单项选择题

The Rational Unified Process (RUP) is a software engineering process, which captures many of best practices in modern software development. The notions of （71） and scenarios have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions – time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive （72） which is concluded with a well-defined （73） and can be further broken down into （74） – a complete development loop resulting in a release of an executable product, a subset of the final product under development, which grows incrementally to become the final system. The content structure refers to the disciplines, which group （75） logically by nature.

（74）处填（）。

A．rounds

B．loops

C．iterations

D．circularities
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单项选择题

早在一个多世纪以前的小说里，人类就开始在火星上散步了，然而直到今天，这还只是个设想。但许多人坚信，问题不是人类能不能登上火星，而是在什么时候、通过什么方式到达那里。就目前的情况看，火星是最有可能成为人类第二家园的地方。因为在所有太阳系的行星中，火星的环境与地球最相像。

A．登上火星的办法很多
B．人类对火星的兴趣不大
C．人们对登上火星缺乏信心
D．人类未来有可能居住在火星上
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