在森林中设防火带的目的是( )
A.隔绝空气
B.隔离可燃物
C.降低温度
D.便于运水
答案:B
–The car comes to a sudden stop. What’s wrong?
– The oil has_____.
A.used up
B.run out of
C.to use up
D.run out
体温每下降1℃,肾小球滤过率约下降()
A.1.3%
B.2.3%
C.3.3%
D.4.3%
E.5.3%