图是某流域地质简图，甲、乙、丙三地有砾石堆积物（见图右下角照片），在甲地砾石堆积物中发现了金刚石。
小题1:B
小题2:B
小题1:本题考查外力作用。外力作用主要通过流水、风力、冰川、海浪等改变地表形态。在河流弯曲处，凹岸受流失侵蚀显著，凸岸主要表现为流水的沉积。图中甲处位于河流的凸岸，金刚石堆积物的成因为流失的沉积作用。所以本题选择B选项。
小题2:根据河流的流向，甲处堆积物主要来自于河流的上游②③支流。根据金刚石矿的岩石为金伯利岩，金伯利岩是一种形成于地球深部、含有大量碳酸气等挥发性成份的火山岩。图中②处为岩浆岩，所以有可能找到金刚石矿。所以本题选择B选项。
【考点定位】本题考查外力作用；岩石的分类。
if only在虚拟语气中的具体用法
would rather/：
if only; wish that…（hope后的宾语从句不虚拟）
I wish I were as strong as you.
I won’t lend you any money even I had money。
51．条件句中. If only one had an unlimited supply of money. If only I could have time to review my lessons. If only problems would come one at a time.
I had rather you told him than I did！
8.表明
He suggested that we have a rest.
太疲倦了. If only he had been here; if…only…（或If only…）表示“要是…就好了”
1．名词性从句：
His white face suggests that his not healthy.;command/!
:
1；If it hadn’t been for…这两种句型表示“要是没有”：
,我们就去; demand/would sooner/even if…
Tom looked sad as if he had heard bad news.
由insist引导的宾语从句可以虚拟也可以不虚拟.建议
If I could only see him once. She would be a very good player if only she could get it together. I dread the coming exams。如果明天能不上班多好;ll go.
3．名词性从句。
7，相当于but for
If it had not been for the PLA man.坚持某事
由suggest引导的宾语从句可以虚拟也可以不虚拟;had rather that…表示“宁愿”
I would rather they came tomorrow：
He insisted that he was right; It is time/：
. If only it clears up, he would not be studying English now.多好
Examples！
6;prefer/propose/!
If only I had listened to your advice.
I could go myself but I would sooner you went. If only I had another chance; as if/!
要是问题一次只发生一个该多好.
suugest/.
How I wish it wasn’t raining;advise/. If only I can take the day off tomorrow.
要是他当时在这儿就好了：
. I am so tired.
只要天一放晴..
+(should) do;request/order/.
要是我再有一次机会就好了. 很明显!
要是财源不断就好了。如果我有时间复习该有多好啊;insist/。
4。
2: 要是。
3;ask/desire that…
They demanded that the aggressor troops (should) be withdrawn immediately.
：
.
我对即将到来的考试非常担心，这种句型省略了主句
2．其他状语从句中.坚持认为
He insisted that we should agree with him; If it were not for…;as though/high time that…
It is time we went to bed, we'.
她若能控制得当就能成为很好的选手
