1 . 听下面一段对话，完成填空。

Well, the cave was first discovered in ______, opened to the public in ______, then closed again in ______.

2 . 听双语新闻—语法填空

Dinosaur footprints discovered in Hebei

More than 4,300 dinosaur footprints have been discovered in Zhangjiakou, North China’s Hebei province, the most found in one spot in the country, according to the Department of Natural Resources of Hebei, which recently disclosed     1     (relate) survey results.

From the footprints,     2     (scientist) can determine how dinosaurs walked, calculate their length, weight and size, and even estimate their walking speed. The site in Zhangjiakou has surpassed the record set at a site in Sichuan province that has over 900 dinosaur footprints. The site has been covered up for     3     (protect) after experts carried out three-dimensional imaging and cast molds of the footprints, according to Hebei’s natural resources department.

3 . 听双语新闻—填词

Dinosaur footprints discovered in Hebei

More than 4,300 dinosaur footprints have been discovered in Zhangjiakou, North China’s Hebei province, the most found in one     1     in the country, according to the Department of Natural Resources of Hebei, which recently disclosed related survey results.

From the footprints, scientists can     2     how dinosaurs walked, calculate their length, weight and size, and even     3     their walking speed. The site in Zhangjiakou has surpassed the record set at a site in Sichuan province that has over 900 dinosaur footprints. The site has been covered up for protection after experts carried out three-dimensional imaging and cast molds of the footprints, according to Hebei’s natural resources department.