CT探测器的作用是（） A.探测病人位置是否准确 B.接收X线并将其转换为电信号 C
题型：单项选择题 A1/A2型题
问题：
CT探测器的作用是（）
A.探测病人位置是否准确
B.接收X线并将其转换为电信号
C.探测扫描时有无散射线
D.将模拟信号转变为数字信号
E.接收X线并检测有无散射线
题型：单项选择题 A1/A2型题
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.