Against what risks do you usually cover the goods?是什么句式?

Against what risks do you usually cover the goods?是什么句式?
句子意思：你通常都会给货物购买哪种保险
介词短语+一般疑问句+主语+谓语结构
还原后：What risks do you usually cover the goods against
what risks 作介词against的宾语
cover 及物动词 vt.
1.覆盖,遮盖
Snow covered the ground.
雪覆盖了大地.
2.掩盖
3.控制,支配
The city covered ten square miles.
这个城市面积有10平方英里.
4.涉及,包含
5.报道
6.走完
7.撒上,洒上,溅上（一层液体、尘土等）
8.足以支付；够付
9.占（一片面积）
10.报道；电视报道
11.代替,顶替,替补（某人工作或履行职责）
12.为免他人陷入麻烦而用谎话或借口）遮掩,敷衍
13.给…保险
14.采取行动（以使自己免遭责备）
15.掩护
16.用枪瞄准（以致无人可逃跑或开枪）
17.翻唱（原来由另一乐队或歌手演唱的歌曲）
18.穿(衣),戴(帽),盖上(被子等)
She covered the baby up with a blanket.
她用毯子把婴儿盖好.
19.使(自己)蒙受(耻辱等)；给(自己)带来(荣誉等)；得到,获得
He covered himself with honours at college.
他在学院里获得多种荣誉.
20.弥补(损失等)
The price barely covers the cost.
这种价格刚够抵上成本.
21.通过,走过(若干里),走完(一段路程)
They covered thirty-five kilometers yesterday.
他们昨天走了35公里.
名词 n.
1.盖子,套子,覆盖物
A box usually has a cover.
箱子通常都有盖子.
2.(书等的)封面、封皮
The book needs a new cover.
这本书需要装个新封面.
3.隐藏物,躲避处
The problem was that with their cover blown they had nowhere to go.
眼前的问题是他们既无藏身之处,又没有别的地方可去.
4.幌子,伪装
The spy's cover was that she was a consultant engineer.
那女间谍伪装成顾问工程师.
5.掩蔽,掩护
For this operation we need plenty of air cover.
为进行这次军事行动,我们需要充足的空中掩护.
6.(一副)餐具,餐席(位)
Covers were laid for eight.
摆好了八副餐具.
7.（保险公司的）保险
8.（生长在一个地区的）树木植物,自然植被
9.（云层的）遮盖；（雪的）覆盖
10.床单；床罩；毯子；被子
11.（对身分、感情或违法事情的）掩盖,掩饰
12.代替工作；代劳；替补
不及物动词 vi.
1.代替(某人)
Will you cover for me at the telephone switchboard while I run out to post a letter?
我出去寄封信,你替我照看一下电话总机好吗?