Manhattan5SC求助

marysuelin

1、a venomous snake was designated the emblem of the rebellion by the insurgency（M5.SC P49第3小题）这话啥意思咧？
2、A new textbook 【focused on recent advances in artificial intelligence】 was assigned by our instructor.
括弧部分应该是定语从句部分吧？那么引导词在定从中做主语不是不可以省略的么？个人觉得应该有个which/that的吧？
3、the proliferation of computer games designed to involve many players at once were first developed before the widespread availability of high-speed internet connections.这个句子的确是很有问题啦~首先我觉得【designed to··】那一part该是定从的，可是我改错了。嗯···那答案我看得也迷糊：computer games designed to involve many players at once have proliferated; such games were first developed before the widespread availability of high-speed internet connections.还是定从主语忽略问题，还有这个句子咋翻译咧？

再来一题：m5sc chap2的练习题No.6 stusents at Carver High school are encouraged to pursue only those extracurricular activities from which stems success in college applications. 红字部分改为:success in college applications stems. 改前改后都对，关键是，这个句子怎么理解？什么意思？答案解释有提到：stems=originates起源于

板栗在奋斗

Computer games designed to involve many players at once have proliferated; such games were first developed before the wide spread availability of high-speed internet connections.
I have a question that why the sentense needs a ";". Whether it is OK just to use an and to connect the two sentenses.