Mei Li:
What became the tallest building in the world when it opened in 1931??
Shuai Zheng:
empire state building
Mei Li:
Which type of dolphin is most commonly seen in zoos and aquaria??
Shuai Zheng:
bottlenose
Mei Li:
How many gills are there in half a gallon??
Shuai Zheng:
16