希望高人能指点一下，在下感激不尽！！！！！！
Now that energy prices are rising so rapidly, further prices are very uncertain, and the risk ________ a new investment depending on them may fail is greater．
A． by which
B． of
C． that
D． in that
请问为什么此题选C呢？再者，能翻译一下吗？我觉得them may fail is greater．有点语法错误。
My consideration is _______ the financial crisis (危机) in the USA will heavily influence China.
A. which
B. if
C. what
D. why
此题选择D。我想问一下选择B可以吗？if表示是否。
Is this research center______ you saw the modern equipment last year?
A.where
B.that
C.the one whereD.the one that
此题选择为什么选择C呢？为什么还要加the one？
All of the flowers now raised here have developed from those ______ in the forest.
A.once they grow B.they grow onceC.they once grow D.once grow
为什么选C呢？首先，我自以为这是一个从句，可是没有什么连词？其次，请问为什么是they once grow 这个顺序？
It was an exciting moment for those football fans this year,______for the first time in the four years their team won the World Cup.
A.that
B.while
C.which
D.when
此题为什么选择C呢？
The traditional view is that we sleep because our brain is "programmed "to make us do so.
麻烦翻译一下这句话，谢谢哈！
希望高人能指点一下，在下感激不尽！！！！！！
第一题： the risk 后面引导同位语从句，而不是定语从句，所以必然用that。if和wihch不能引导同位语从句。可以引导同位语从句的还有when, whether等。英语当中的同位语从句和定语从句往往让中国学生混淆，分不清，原因是将两种从句翻译成汉语时，都会被译为“……的……”，貌似是一样的。像这个题，risk 后面的"a new investment depending on them may fail "是一个完整的句子，有主语有谓语的，一定就是同位语从句了。直译为“一个新的依靠能源的投资项目可能会失败的风险会更大”the risk... 翻译成 ...的风险。定语从句的从句部分缺成分，缺主语、宾语时，缺的就是先行词。而where和
1、may fail is greater 指的是 a new investment，而不是 them ，它是说 a new investment depending on them , depending on them 是补充说明 a new investment 。2、这句话翻译过来是“我考虑的是，为什么在美国金融危机将严重影响中国”，只有用
