下列哪一项建筑的设计没有涉及到数学中的悬链线？（）
A.数学桥
B.圣路易拱门
C.刘门坞村迎仙桥
D.天石拱桥
参考答案：A
用所给词的适当形式填空
1. Tony didn't find __________(learn) English easy.
2. If you keep __________(study) hard, you'll catch up the other students.
3. At different __________(time) of the day, the colours of the rock change from purple to red.
4. The hill is 348 __________(metre) high.
5. The ancient stories always describe the spirits that __________(create) the world.
用绝缘电阻测试仪（摇表）测量绝缘电阻时，应将被测物体接在绝缘表的（）。
A.L端和E端
B.L端和G端
C.E端和G端
D.任意两端
