两个圆柱体x2+y2≤R2，x2+z2≤R2公共部分的体积V为（）。
A.
B.
C.
D.
参考答案：B
Many women work in big companies，but in the boardrooms of most big companies, women are in the _______.
A．scarcity
B．minority
C．majority
D．popularity
判断下列对话是(T)否(F)正确。
( ) 1. A: Nice to meet you!
B: Nice to meet you, too!
( ) 2. A: What's in the classroom？
B: Many desks.
( ) 3. A: Let's clean our classroom.
B: Good.
( ) 4. A: What's this?
B: It's a book.
( ) 5. A: May I have a look?
B: Sure. Here you are.
