最常见的液态栓子是
A．血栓栓子B．脂肪栓子C．羊水栓子D．细菌栓子E．肿瘤栓子
参考答案：B
—How can I see thick snow in most northern parts of China?
—You have to wait till _____ comes, Steve. [ ]
A. summer
B. autumn
C. winter
D. spring
.
A．.
B．.
C．.
D． .
