选项

实验目的

实验方案

A

稀释浓硫酸

将浓硫酸沿器壁慢慢注入水里，并不断搅拌

B

鉴别氮气和氧气

将带火星的木条插入集气瓶中，看是否复燃

C

测某溶液的酸碱度

滴入酚酞试液，观察溶液颜色的变化

D

除去固体氯化钾中少量的二氧化锰

加水溶解后，过滤、蒸发

Throwing tomatoes--Spain( 西班牙)

    Spain takes "tomatoes fights" to a whole new level. But the tomatoes are being thrown, not eaten. The festival takes place during the last Wednesday in August.  Trucks (卡车) carry tomatoes into the square. People rush to the tomatoes and throw them into the people.

Rolling (滚) cheese-England

    This festival is celebrated on the last Monday in May. It takes place on Cooper's Hill. A large wheel of cheese（奶酪） is roiled down Cooper's Hill. The festival is actually a race where people run down the hill after the rolling cheese. The first person to cross the finish line at the bottom of the hill wins the cheese.

Pouring water—Thailand

    The Songkran Festival is the celebration of the New Year in Thailand. Rather than a single day, Thailand celebrates the New Year from April 13th to April 15th. Thai people run after each other, pouring water. Songkran is one of the most important reasons why foreigners travel to the beautiful land.