以下哪几种茶俗有烤茶的工艺？（） A.土家族擂茶 B.基诺族凉拌茶 C.白族三道茶

山楂中有机酸的含量测定采用

A．高效液相色谱法
B．气相色谱法
C．紫外-可见分光光度法
D．酸碱滴定法
E．薄层扫描法

下列各选项中属于商品的一组是

①居民家里使用的自来水 ②社会团体捐献给灾区人民的生活用品　③农民生产的粮食  ④市场上出售的蔬菜

A．①④

B．②③

C．①③

D．②④

このあたりの海岸線の形を５０年前と　　　　。してみましょう。

A．測定

B．　一致　

C．比較　

D．統一

在CIC（86）船舶战争、罢工险条款中，下列哪些原因引起的事故属于承保责任（）

A.任何人怀有政治动机的恶意行为

B.民变、暴动或其他类似事件

C.船舶被舶籍国政府扣押或没收

D.战争结束后，遗留在航道中的水雷

The level of lead contamination in United States rivers declined between 1975 and 1985. Federal regulations requiring a drop in industrial discharges of lead went into effect in 1975, but the major cause of the decline was a 75 percent drop in the use of leaded gasoline between 1975 and 1985.
Which of the following, if true, best supports the claim that the major cause of the decline in the level of lead contamination in United States rives was the decline in the use of leaded gasoline

A．The level of lead contamination in United States rivers fell sharply in both 1975 and 1983.

B．Most of the decline in industrial discharges of lead occurred before 1976, but the largest decline in the level of river contamination occurred between 1980 and 1985.

C．Levels of lead contamination in rivers fell sharply in 1975-1976 and rose very slightly over the next nine years.

D．Levels of lead contamination rose in those rivers where there was reduced river flow due to drought.

E．(E) Although the use of leaded gasoline declined 75 percent between 1975 and 1985, 80 percent of the decline took place in 1985.