《2025年习题e百课时训练九年级英语全一册人教版》

五、语法填空
On the dark night of May 5 in the year 1110,the moon slowly disappeared. Though the stars and the sky could be seen 1. clearly (clear),the moon couldn't be seen until nearly daytime. People expressed their worries about it,but nobody 2. knew (know) what happened. For over 900 years,scientists have been trying to find out what caused 3. the strange event. However,hardly anybody was able to come up with any ideas.
Now scientists have finally found an answer—volcanoes(火山)! The forgotten eruptions(爆发) of Japan's Mount Asama happened around the beginning of September in 1108 and lasted nearly two 4. months (month). A lot of ash(灰尘) was 5. produced (produce). It moved towards the sky slowly and finally covered the moon.
But 6. how did scientists discover this? They checked the ice from Greenland and the Antarctica. The huge ice is 7. useful (use) to scientific study. It can show what the climate(气候) was like a long period of time ago 8. and what was in the air at that time. Scientists noticed that there was more volcanic ash in the ice around May 5,1110.
Tree rings(年轮) also helped 9. in getting the answer. The rings change thickness with the climate. Scientists were able to see the year 1109 was a cold and rainy year and that people failed 10. to get (get) enough food. This supported the idea that a volcano had erupted.

答案： 1. clearly 2. knew 3. the 4. months 5. produced 6. how 7. useful 8. and 9. in 10. to get