符合风湿性心脏病二尖瓣狭窄的典型体征是

A．周围血管征

B．心房颤动

C．肺动脉瓣区第二心音亢进

D．心尖区舒张期隆隆样杂音

E．心尖区第一心音亢进

The early railroads were connected short lines in the existing arteries of transportation: roads, turnpikes, canals, and other waterways.

A. short lines that connected
B. those short fines connected
C. connected by short lines
D. short connected lines