继续请教几道语法题，万分感谢！

ivory

PP1-4
92. The major (component) of the sedimentary rock called shale is clay, an (earthy), fine-grained material consisting (primary) of a (particular) group of crystalline minerals.
答案是C，改Primarily为副词形式，修饰consisting吗？

93. Copper was the first (metal used) by humans and is second (only) to iron (into) its utility through the (ages).
C改成什么呢？

PP2-4
101. The (migration route) of the first humans to occupy North America took (them across) a land bridge that once (was connected) Asia with (what) is now Alaska.
今天做的我都糊涂了，选C，that后面是个定语从句，为什么不要was呢，那样不就成了后置定语了吗，不对啊，请帮忙指教！又看了一遍，bridge用的是主动语态对吗/

110. A drought is (a period of) dry weather that (lasts too long) enough (to cause) a (serious imbalance) in the water cycle.
不明白B,用lasts有什么错吗，前面是dry weather，请指教！

112. (Although) absolute zero cannot (actually) be reached, approximations of (less than) 0.001 degrees Celsius above absolute zero have been (created) the laboratory.
选D，不明白为什么，虽然我没有答案。我认为create是个及物动词，应该直接加labortory啊，为什么还要有in the laboratory呢？

113. (That) brought about the widespread extinction of teh dinosaurs is (unknown); it(must), however, (have involved) major changes in the environment.
选A,不明白为什么，怎么改？能详细讲讲吗？

另外，similar是不是需要放在形容词前，例如：a similar ecological role?

psywang

1-92. 同意你的说法
1-93. 我认为应该改为“in”

2-101. bridge句中确实应是主动语态，句中“that”指代“bridge”
2-110. --> last long. "too"多余了！
2-112. －> in the laboratory,表示在实验室中被制造出来。
113. －> what. What引导的主语从句在句中做主语。

[此贴子已经被作者于2004-4-16 0:05:08编辑过]

xkfy0521

对，楼上的解释偶非常赞同。。。。