镇痛强度与吗啡相近，但成瘾性发生慢，戒断症状相对较轻的药物是（）
A．哌替啶
B．喷他佐辛
C．美沙酮
D．纳洛酮
E．吲哚美辛
参考答案：C
请根据汉语提示写出单词的正确形式
1. Our country has become self-sufficient in ______ (粮食).
2. The road signs _________(使糊涂) the driver.
3. The only way to do that is to ______ (减少) expenses.
4. The school _________(提供) books for children.
5. We took the opportunity to _______(交流) experience with them.
6.He has a (晒黑的) face and bright eyes.
7. The ________ (斗争) for independence was long and hard.
8. The factory must increase its ________(产量).
9. They ________(用掉) all their strength in trying to climb out.
10. Our army is well _______ (装备).
Na2SO3不是钻井液常用除氧剂。（）
