题目

You’ve failed to do what you ____________ to and I’m afraid the teacher will blame you. A．will expect         B．will be expected        C．expected           D．were expected 答案：D一般来说，越高等的生物具有越复杂的后天性行为．下列几种牛物，后天性行为在全部行为活动中占有比重最大的是A.黑猩猩B.家鸽C.蝗虫D.蚯蚓