题目

The professor could hardly find sufficient grounds _____his arguments in favor of the new theory. A. to be based on     B. to base on    C. which to base on    D. on which to base 答案：D 解析: on which to base his arguments in favor of the new theory = The professor will base his arguments in favor of the new theory on sufficient grounds.计算：（1）（-4）×1.25×（-8）；　　　　　（2）（-10）•（-8.24）•（-0.1）；（3）-×2.4×；　　　　　　　　 （4）（-+-）×36；（5）-×（8-1-0.04）；　　　　　　（6）71×（-8）．