1Most of Portugal’s 250,000 universitystudents boycotted classes in a one-day strike to protest a law that requiresthem to contribute $330 a year toward the cost of higher education,previously paying $7 per year.

• year     toward the cost of higher education, previously paying $7 per year
• year     toward the cost of higher education, for which was previously paid $7 per     year
• year,     compared to the previously $7 per year, toward the cost of higher     education
• year     toward the cost of higher education, instead of the $7 per year required     previously
• year as     opposed to the $7 per year required previously for the cost of higher     education

答案是D，搜了下，选啥的都有，我个人还是倾向D，请大家讨论下
2.Gas hydrates, chemical compounds of waterand natural gas, are increasingly being studied for their potential to behuge reservoirs of energy, possibly causing sea floor instability, andsignificant contributors to global warming.

• to be huge     reservoirs of energy, possibly causing sea floor instability, and
• to be huge     reservoirs of energy, possibly causing sea floor instability, and even as
• as huge     reservoirs of energy, possibly causing sea floor instability, and
• as huge     reservoirs of energy, and the possible cause of sea floor instability,
• as huge     reservoirs of energy, as possible causes of sea floor instability, and     even as

答案是A，我选E，搜了一下，大家都在A和E之间争论。

3.Researchers agreed that the study of newtreatments for heart attack patients was extremely important but moreresearch was needed to determine that balloon angioplasty preceded withultrasound was or was not any better for heart attack patients than theballoon procedure by itself.

• more     research was needed to determine that balloon angioplasty preceded with     ultrasound was or was not any better for heart attack patients than
• more     research was needed for determining whether or not balloon angioplasty     preceded by ultrasound is any better for heart attack patients than is
• that more     research was needed to determine whether balloon angioplasty preceded by     ultrasound is any better for heart attack patients than
• that more     research was needed to determine that balloon angioplasty preceded with     ultrasound was any better for heart attack patients than
• that more     research was needed for determining that balloon angioplasty preceded by     ultrasound is or is not any better for heart attack patients than is

答案是B，我选的C，搜了下，还有选D的，彻底晕菜了

4.In addition to being China’s first administrators, in the sense thatthey developed a coherent bureaucracy for their empire, the first literateculture in East Asia were the Shang, and theywere well known for crafting ornate bronze ritual vessels.

• the first     literate culture in East Asia were the     Shang, and they were well known for crafting
• the first     literate culture in East Asia were the     Shang, well known as the crafters of
• the Shang,     as the first literate culture in East Asia,     is well known for its crafting
• the Shang     were the first literate culture in East Asia     and are well known as the crafters of
• the Shang     were the first literate culture in East Asia     and well known for its crafted

答案是D，为什么这里要用复数呢？虽然看到前边的THEY所以考虑到用复数，但我还是不明白为啥要用复数，搜了一下，好像大家都有这个问题。

GWD的这几道争议题我基本上都是和dancingcandy持相同意见的。
最后一道题我有一点看法，认为答案D是正确的。
用复数主要的理由还是来自未划线部分they的提示，而且我认为只能根据这里的提示。
我刚才在网上搜索了一下，对于the Shang，用单复数的都有。因为它既可以认为是商朝（单数），也可以看作商朝人（The Shang people的省略形式，复数）。判断其但复数惟有通过上下文判断，在只有一句话的SC题目中出题人也只能通过未划线部分给我们提示了。