蒸汽吊车使用的油脂分为几种？

下图反映的是一定时期某种普通商品供求量(Q)随价格(P)变化的情况。其中，D为需求曲线，S为供给曲线。假定其他因素不变，下列判断正确的(　 　)

①当该商品供给量与需求量均为Q0时，其均衡价格为P0 

②当该商品价格由P0向P1变动时，该商品的替代商品需求量将减少

③当该商品价格由P0向P2变动时，该商品的互补商品的价格可能会上涨

④当该商品价格处于P1时，该种商品供过于求            

A．①②

B．③④　　　

C．①③　　　

D．②④

 根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项是多余的。  

Shopping is not as simple as you may think! There are all sorts of tricks at play each time we reach out for that particular brand of product on the shelf.

  1 . Health foods are packaged in greens, yellows or browns because we think of these as healthy colors. Ice cream packers are often blue and expensive goods, like chocolates, are gold or silver.

  2 . Recently, some kind of pain killer was brought out, but researchers found it didn’t sell well, because the color made the product look weak and ineffective. Eventually, it came on the market in a dark blue and white package -- because we think of blue as safe, and white as calm.

 3 . But quite often a bottle doesn’t contain as much as it appears to.

It is believed that the better-known companies spend, on average, 70 percent of the total cost of the product itself on packaging!

The most successful producers know the troth:   4 . The founder of Pears soup, who for 25 years has used pretty little girls to promote their goods, came to the conclusion: “  5 .”

A．It’s not enough to have a good product.

B．Coloring, for example, varies according to what the producers are trying to sell.

C．Any fool can make soup, but it takes a genius to sell it.

D．The colors tricked the customers into shopping.E. The size of a product can attract a shopper.

F. A good product is an advantage.

G. The colors turned the customers off.

《澧水船夫号子》是（）民歌，《放马山歌》是（）民歌，《脚夫调》是（）民歌，《茉莉花》是（）民歌，《沂蒙山小调》是（）民歌，《交城山》是（）民歌，《军民大生产》是（）民歌，《小河淌水》是（）民歌，《太阳出来喜洋洋》是（）民歌。

2011年7月26日，中国载人深潜“      ”号在下潜实验中成功突破5000米水深大关，并成功回收。创造了中国载人深潜新的历史。

A．蛟龙

B．铁龙

C．雪龙

D．骄龙