伽利略通过梁的弯曲试验和理论分析，指出对长度相似的圆柱形梁，抗弯力矩和半径立方成比例；1685年，牛顿发现了万有引力定律：两个物体之间有引力，引力和距离的平方成反比，和两个物体质量的乘积成正比。从这两个事例中可以看出自然科学的特征之一是[ ]

A．实验是近代科学研究的全部方式

B．17世纪物理学是核心学科和基础学科

C．数学方式是主要表达形式

D．揭示时问和空间的本质属性

单词拼写(6)

小题1:I like Pam --- she has a really good s______________ of humor.

小题2:The light suddenly went out ,leaving us in the d_______________.

小题3:She had a g_______ at her watch and then left in a hurry.

小题4:Stay in groups, as sharks usually _________(避免)large numbers of people.

小题5:“We are back at last”,  said the father in _________(轻松)

小题6:The farmers ________ (饲养)many animals and cook them for food.