1 . According to a study from Yale University, good friends are often genetically similar.________________,good friends can share up to 1% of the same genes.

A．As a result

B．In fact

C．Above all

D．Without doubt

2 . You should book your flight about two or three weeks _____ so that you can enjoy a lower price.

A．in particular

B．in advance

C．in return

D．in fact