Yesterday we up our Christmas tree.[ ]
A. putted
B. put
C. puted
D. puts
答案:B
若函数y=f(x)在区间[a,b]上的图象为连续不断的一条曲线,则下列说法正确的是( )
A.若f(a)f(b)>0,不存在实数c∈(a,b)使得f(c)=0;
B.若f(a)f(b)<0,存在且只存在一个实数c∈(a,b)使得f(c)=0;
C.若f(a)f(b)>0,有可能存在实数c∈(a,b)使得f(c)=0;
D.若f(a)f(b)<0,有可能不存在实数c∈(a,b)使得f(c)=0;
________ you have finished your report, you can have it __________. [ ]
A. Now for; printing
B. Now that; printed
C. So far; been printed
D. So that; being printed