题目

   Dogs have a very good ______    of smell and are often used to search for survivors in an earthquake. A. sense          B. view           C. means          D. idea   答案：   A     a sense of smell嗅觉。句意为：狗嗅觉灵敏，经常被用来搜寻地震中的幸存者。  如图，抛物线y=x2+1与双曲线y=kx的交点A的横坐标是1，（1）求k的值；（2）根据图象，求出关于x的不等式kx+x2+1＜0的解集．