超声引导下进行肾脏穿刺活检，最易产生的并发症是（）
A.尿路感染
B.肾内血肿
C.血尿
D.肾包膜下血肿
E.肾包膜外血肿
参考答案：C
Our National Day falls ___ October 1 and thousands of cars pour into freeways ___ the early morning of the holiday.
A．on; in
B．in; on
C．on; on
D．in; in.
