题目

—What do you admire the spaceman ______?k*s5u    —His bravery to travel around the earth ______ a spaceship all alone.    A. for; in                B. to; by                C. for; by                                   D. as; in 答案：A16．546÷91，把除数看作90来试商，从前两位除起，不够商1，就看546里面有几个90就商几．