题干
In view of lacking preparations for the competition and not wanting to lose face,
Johnson eventually decided to _____.
A：drop i
B：drop off
C：drop back
D：drop out
答案(点此获取答案解析）
D
＝
的图象与直线12x＋y－1＝0相切于点（1，－11），则a＋b的值为（ ）
