题目

X、Y、Z是同周期主族元素，它们的最高价氧化物分别为酸性氧化物、碱性氧化物、两性氧化物，则X、Y、Z的原子序数大小顺序为A．X > Y > Z                     B. Y > Z > X        C．X > Z > Y                     D．Z > X > Y 答案：C 完形填空。Coffee has been a part of people’s lives for 1 years, and it is still a favorite drink in the world. Here is a story of coffee and 2 it was discovered.　　The story 3 us coffee was discovered in Africa 4 . One day a farmer 5 his goats, and he saw them 6 some berries(种子) from a plant. The goats became 7 after they ate the berries. The man felt tired, 8 he decided to try the berries, too. 9 , he didn’t feel tired any more. Coffee plants were thus discovered. The coffee 10 from Africa to other countries. After that the farmers started to grow coffee plants there, especially in South America.( )1. A. thousand of B. thousand C. thousands of D. a thousand of( )2. A. how B. why C. what D. who( )3. A. says B. speaks C. talks D. tells( )4. A. long, long time ago B. long, long times ago　　 C. long, long time before D. long, long time later( )5. A. watch B. watches C. was watching D. is watching( )6. A. eat B. eats C. ate D. has eaten( )7. A. very tired B. very active C. badly ill D. fast asleep( )8. A. but B. or C. because D. so( )9. A. For his great surprise B. With his great surprise　　 C. To his great surprise D. To his great surprises( )10.A. were taken B. were brought C. was taken D. brought