试题题干
gravity的意思是（ ）
参考答案
正确答案：
试题解析
gravity n.重力；严重；庄重，严肃
例句：Arrows would continue to fly forward forever in a straight line were it not for gravity, which brings them down to earth.
句意：要不是重力使箭掉落地上，它将会一直沿直线往前飞行。
所以本题选C。