题干
This book is a little above my head, because there are too many new words in it.
A：expensive
B：difficult
C：interesting
D： boring
答案(点此获取答案解析）
B
This book is a little above my head, because there are too many new words in it.
A：expensive
B：difficult
C：interesting
D： boring
是平面
的斜线，直线
垂直于
；
，且