题目

 已知=1，=,=0,点C在∠AOB内，且∠AOC=30°，设=m+n(m、n∈R)，则等于A.              B.3            C.         D.  答案：B听下面一段材料，回答第1-2题。 1. What was the man doing during the earthquake? A. Shouting. B. Running. C. Sleeping. 2. How was the man when the earthquake took place?  A. He was ill. B. He was helpless.C. He was frightened.