若tan$\theta$+$\frac{1}{\tan \theta }$ =4,则sin2$\theta$=（    ）

羊肚菌是生长在我国西北方地区的一种优良食用菌．含有苯丙氨酸、苏氨酸和缬氨酸等7种人体必需氨基酸，含抑制肿瘤的多糖，抗菌、抗病毒的活性成分，具有增强机体免疫力、抗疲劳、抗病毒、抑制肿瘤等诸多作用．根据以上信息，判断下列说法正确的是（　　）

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The US public uses about 50 billion water bottles a year and most of those ____ bottles are not recycled, according to Elizabeth Royte’s book Bottlemanid: How Water Went on Sale and Why We Bought It.

More than $100 billion is spent every year on bottled water in the U.S. in many developing countries where there isn’t a safe ____ of tap water, bottled water is the only choice.

In the US, tap water is controlled by the government and often ____ for dangerous substances(物质). Each American drinks 79 litres of bottled water per year ____. The bottled water industry is so successful that it has outpaced milk, coffee, and juice in the number of gallons of drinks sold – putting it behind only beer and soda.