问题
填空题
焦距指（）
答案
参考答案：焦点至透镜的距离
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焦距指（）
参考答案：焦点至透镜的距离
| 用方框中所给词的适当形式填空。 | |
2. Please give the boy's _____ to our teacher. 3. Ben is a _____ student. He often comes top in our class. 4. He had an accident _____, he wasn't badly hurt. 5. Of the three pictures,this one is _____. 6. What are you going to do in the new _____. 7. It's _____ that all of them are interested in reading. 8. If you have a balanced diet, you'll be sure in good _____. |