题目

 ----- I’ve nothing on me except this ten-yuan note to donate, I’m afraid. ----- Never mind. ______. We really appreciate your assistance. A. Every little helps                                       B. The more, the better C. It’s better to give than to receive            D. No one is perfect 答案：A17．如图所示，把一根塑料绳的一端扎紧，从另一端撕开许多细丝，用干燥的手从上向下捋几下，发现细丝张开了．下列分析正确的是（　　）A．细丝张开的原因是带了异种电荷互相吸引B．细丝张开的原因与验电器的工作原理相同C．细丝带了电是通过摩擦的方法创造了电荷D．细丝带上了电的实质是分子在物体间的转移