电线杆高约是15[ ]
A.米
B.平方米
C.平方分米
答案：A
——What do you usually do in your free time?
—— I enjoy reading in the library ________ has many good books.
A．when
B．who
C．which
D．what
消费者对应的是香农韦弗模式中的（）
A.信源
B.信宿
C.渠道
