1 . The book From the Soil provides ________ unique opportunity to learn more about Chinese society.

A．a

B．an

C．the

D．不填

2 . The sale of saltpeter(硝酸盐)to foreigners was banned in 1076. Nonetheless, knowledge of the miraculous substance was carried along the Silk Road to India, the Middle East, and Europe. In 1267,_______ European writer made reference to gunpowder, and in 1280 the first recipes for the explosive mixture were published in the west. China’s secret was out. (用适当的词填空)

3 . “Despite a history of more than 3,000 years, the image of flower arrangement sometimes is still limited bunches of flowers in flower shops.” Zhang Yan, _________ master of the art, said. (用适当的词填空)

5 . （2022全国甲卷）________ friend of his, Wu Fan, volunteered to be his companion during the trip. （用适当的词填空）

6 . In some regions, particularly in the western United States, drought is ________ serious problem facing communities. （用适当的词填空）

7 . At this point, however, the unique culture that produced these man-made objects remains ________ mystery. (用适当的词填空)