哥哥姐姐帮指点小妹一下，大后天要考试了。

aleafasboat

Because it is often dependent of the conditions ( of ) crystalization,the composition of the (minerals) in a rock can be important in  determining the rock's geologic history.

这里答案给的是of但是我觉得前面it 指代后面的minerals 有问题。

(During first) ten years of the space age,which began in 1957,more than 500 artificial satelites were rocketed (into orbit) around the earth.

这题我觉得into orbit没有冠词，请你们帮帮忙。谢谢阿。。。。

hhdh2608

是第一个OF错了吧,dependent on

it指的是composition

个人意见

期待大家指正

require

it stand for composition:i think

pick the obvious one,during the first ten years,,,

落九天

以下是引用require在2005-3-5 12:31:00的发言：

it stand for composition:i think

pick the obvious one,during the first ten years,,,

请斑竹解释出原因，谢谢。

aleafasboat

1是不是我下的题目标明的是第2个of.

2是不是during the first ten years,~~~~~~~~~.