从结构层次上看，下列哪项与其他三项不同（  ）

There are many        animals in the zoo，and some of them are     scary．    

小科在帮妈妈剥蚕豆时，脑海中冒出有个想法——测量一粒蚕豆种子的密度。经过一番考虑，小科设计了如下图所示的实验过程。

说明：图甲为将蚕豆种子放入清水中，蚕豆种子下沉到容器底部。

图乙为将清水中加入适量食盐，并用玻璃棒不断搅拌，蚕豆会悬浮于食盐水中。

阅读短文，下列问题

B

    Jilin Province is located(位于) in China's northeast. It has a long winter with snow that can last for seven months a year. Many people go to Jilin for the Ice Lantern Festival and winter sports.

    Jilin also has many natural and historical attractions, including the famous Mount Changbai. 

    The following is one of the top 10 attractions in Jilin.

    Located in the southeast of Jilin City, Jilin Province, Songhua Lake is one of the most famous artificial (人工的) lakes in China. 

    Covering a total area of 550 square kilometers, the lake has a maximum water capacity (最大蓄水量 ) of 10.8 billion cubic meters. The lake, which looks like a string of pearls, is 200 kilometers in length, 10 kilometers at its widest point, and 75 meters at its deepest point.

    The Songhua Lake consists of nine scenery zones, including Wuhu Island, Wolong Pond, Fengwu Pond, Shilong Wall, Hailang Hill, Shuangfeng Ridge, Luotuo Peak,Qingshan Hill and North Heaven Gate. It is a perfect place for people to visit.