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【简答题】
大约在牙被拔除（）后，牙膜和附近骨髓腔血管断端闭合，出血停止，血液凝集形成血凝块将创口封闭。拔牙后（），血块开始机化。术后（）上皮开始自牙槽边缘向血凝块表面生长。拔牙后大约第7天，在牙槽骨内板及附近骨髓腔内开始有破骨细胞及成骨细胞活动，并有新生成的骨基质附着于原有骨小梁。新骨还需通过钙化、改建，最终才能形成完全正常成熟的骨组织，此过程至少需要（）的时间。
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举一反三
【单选题】When the economy is in recession, jobs are generally harder to find and more people go to college. We can conclude that the opportunity cost of
A.
going to college decreases when the economy is in recession.
B.
going to college increases when the economy is in recession.
C.
working increases when the economy is in recession.
D.
working is zero when the economy is in recession.
【简答题】骨盆是由 、 及 所组成
【单选题】amici vecchi
A.
amici anziani
B.
amici da tanto tempo
C.
uomo molto famoso e importante
D.
uomo molto alto
【单选题】vecchi amici
A.
amici anziani
B.
amici da tanto tempo
C.
uomo molto famoso e importante
D.
uomo molto alto
【简答题】A．NRZ B．AMI C．曼彻斯特 D．4B/5B
【单选题】When the national economy is faced with a recession or high inflation, the government engages in active policies with timely attempts to move the economy back ______.
A.
with the right track
B.
on the right track
C.
for the right track
D.
in the left track
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