About 2,000 years ago, the king of Syracuse, Greece, asked a goldsmith（金匠）to make a gold crown（皇冠）. A few days later, the goldsmith brought the crown to the king. It was as _________ as the gold the king gave to the goldsmith, but the color of the crown was a little strange.

“Did the goldsmith take some gold and mix _________ metals（金属）into it?” the king thought to himself. He felt that the goldsmith had lied and had used silver（银）in the golden crown and kept some gold for himself. But _________ could the king find out the truth if he didn’t break the crown? He then asked Archimedes, his scientist, to do this job.

Archimedes _________ this question carefully day and night. One day, he poured too much water in the bathtub（浴缸）while taking a bath. _________ he stepped into the bathtub, a lot of water came out from it. “I knew _________ !” He suddenly shouted. An idea appeared in his mind: the water coming out of the bathtub took up（占据）the same volume（体积）as his body.

The next day, Archimedes _________ two bowls with water and put them in two larger containers（容器）. Next, he took a gold cube（立方体）. It was as heavy as the crown. He then put the crown and the gold cube in each bowl. Some water in both bowls came _________ the two larger containers.

The crown sent out more water than the gold cube _________. It meant that there was something else mixed in the crown. The metals took up more __________ in the water than pure（纯的）gold did.

Archimedes reported his finding to the king. Because Archimedes took a bath, the dishonest goldsmith was now in hot water!

【推荐3】Blueberries (蓝莓) are nice. But do you know _____ blueberries grow? They grow on bushes. Each blueberry is small and round. Many blueberries can grow on one bush. At _______, blueberries are green. The green berries are not ready to eat. They _____ a lot of sun and rain. The sun and rain can help them ______ fat and sweet. When the berries turn blue, they are ripe. Now people are ready to pick them.

Some farmers grow blueberries in big fields. The people near the fields often help pick the blueberries. They can make money. ______ of them takes a pail (桶) out to the field and fills it with blueberries. They work very fast, so they can fill many pails. They want to make much ______. When they are working, their fingers (手指) are ______ from the juice of the berries.

After people pick the blueberries, they put the berries in the boxes and send them to ______. People buy the blueberries and take them home ______. Some people like to wash the berries and eat them one by one. Other people like to ______ with blueberries. They make blueberry muffins (松饼) and cakes. Blueberries taste great!