Question

—Susan, what are the advantages of MP5 players?
—Mom, they are smaller and lighter ______ they can be carried very easily.

A．unless

B．if

C．until

D．so that

Answer 1

D

unless除非，如果不；if是否，如果；until     直到；so that以便，所以。句意：苏珊，ＭＰ５播放器的优势是什么？——妈妈，它们更小更轻便，所以它们携带非常方便。结合语境可知前后是因果关系，故选Ｄ。