诊断牙隐裂的是（）
A.温度测试
B.染色法
C.选择性麻醉
D.X线检查
E.叩诊
参考答案：B
解析：掌握几种常用的检查方法。
79， 63， 55， 51， 49， ( )
A．48
B．47
C．46
D．45
Why was the world market important for the United States agriculture
A．It provided evidence that Jefferson’s ideal could be achieved.
B．It made farmers less dependent on local bankers.
C．It affected the prices that farmers could receive for their crops.
D．It decreased the power of the railroads to control farm prices.
