As a saying goes, he who doesn't reach the Great Wall is not a true man. The Great Wall in China ____(impress) everyone who sees for the first time ____ the general tourists to scholars. The vastness of the structure helps children grasp the great ____(achieve) in human history and can help inspire them ____ (learn) more about human success over one thousand years.____ (construct) over a period of 2,000 years, the stone solider ____(actual) consists of many great walls, some of____date back to the fifth century B.C. The first emperor of China, Qin Shi Huang,____ (order) these earlier long wall sections linked and extended with watchtowers to protect the new empire from northern tribes. Succeeding emperors and dynasties continued the construction.____ (spread) westward into the Gobi desert to guard____Silk Road. All together, the walls may have stretched more than 30,000 miles.

生物体内的蛋白质千差万别，其原因不可能是  （）

人体口腔上皮细胞常被用作动物细胞的观察材料．

计算：$0.{16}^{-\frac{1}{2}}+{\left(-\frac{5}{9}\right)}^0+{{\left(-2\right)}^3}^{-\frac{4}{3}}+{16}^{-0.75}+{\left|-0.001\right|}^{\frac{1}{3}}$.