二尖瓣关闭不全的重要体征是
A．二尖瓣开放拍击音B．心尖区第一心音亢进C．二尖瓣面容D．心尖部隆隆样杂音E．心尖部收缩期吹风样杂音
参考答案：E
In the end, they crossed the mountain _____top was covered with snow all the year round and
reached their destination. [ ]
A. which
B. where
C. whose
D .that
监视居住最长不得超过( )
A．3个月
B．12个月
C．4个月
D．6个月
