进行性吞咽困难
参考答案：进行性吞咽困难 食管癌患者的典型症状，先是难咽干的食物，继而难咽半流质，最后水和唾液也不能咽下。
商品流通渠道的起点是( )。
A．消费者
B．生产者
C．批发商
D．零售商
An investor gathers the following information about three U. S. Treasury annual coupon bonds:
If bond price converge to their arbitrage-free value, what should happen to the price of Bond 3（）
A. Selling pressure should decrease its value.
B. Buying pressure should increase its value.
C. Selling pressure should increase its value.
