1 . Two Chinese astronauts headed outside the nation’s Tiangong space station on February 9, 2023 for   ________ seven-hour-long spacewalk, ________ first of the ongoing Shenzhou 15 mission.

A．a; the

B．the; the

C．a; a

D．the; a

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)

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

8 . The Hunchback of Notre-Dame, presented the building to ________​wide audience of readers. （用适当的词填空）

9 . Getting in​ ________slow-moving queue to check in our baggage when our flight is about to leave is also enough to make our blood pressure soar. （用适当的词填空）