Now looking at bilateral trade, back in 2000, it turns out that China was only Brazil's 12th largest trading partner. But look at this today, well as you might be surprised, or might be not surprised,  it's No. 1.  BBVA from Argentina says soybeans and iron ore just right here which is used for steel account for 40 to 50 percent of all Brazil's export to China.

1 well as you might be surprised, or might be not surprised,  it's No. 1.

as引导让步状语从句时，从句的表语或状语必须前置于as之前。所以这是as引导的让步状语从句。

2000年，中国是巴西的第二大贸易伙伴。但看看现在，虽然你可能感到很惊讶，也可能你不惊讶，中国是巴西第一大贸易伙伴了。

2 which定语从句修饰哪个名词，可以从二方面判断：1）语法，which后接is，说明先行词为单数或不可数名词，排除soybeans(复数）。2）逻辑，定语从句意为用于炼钢。黄豆和铁矿石，哪个用于炼钢？。网友问这个问题时，就没有用脑。