填空题

填空题 What is the missing letter?

E	C	O
B	A	B
G	B	N
D	B	？

填空题 Which number should come next in this series?
3, 5, 8, 13, 21, ?

填空题 The map gives the location of six towns A, B, C, D,E and F, but the locations of the towns are not given. C is south of A and southeast of D. B is southwest of F and northwest of E. Which town is southwest of A?

填空题 At the end of a banquet 10 people shake hands with each other. How many handshakes will there be in total?

填空题 What number is missing from the segment below?