单项选择题
What does the term TO NAVIGATE WITH CAUTION mean?（）.
A.To navigate intentionally B.To navigate intensely C.To navigate carefully D.To navigate completely
单项选择题 What are symptom(s) of a ruptured appendix?（）
单项选择题 We have no steel wire．You had better（）us one.
单项选择题 Tripping defects in anchors frequently occur in（）.
