谈论发明创造与奇思妙想 — 英语选择题
题目
学校科技社想设计一种发明，帮助骑车回家的同学。它必须在天黑时让骑车人更容易被看见，还要提醒后面的车辆骑车人要向左还是向右转。哪种设计同时满足这两个要求？ A. A helmet that shines a light and shows a left or right signal. B. A bike bell that plays a song when the rider stops. C. A backpack that keeps books dry on rainy days. D. A bike seat that becomes softer on long rides.