I am going to the zoo ______ my cousin Jack.
A:at
B:with
C:in
如图,已知四棱锥P﹣ABCD中,PA⊥平面ABCD,底面ABCD是直角梯形,
且∠DAB=90°,∠ABC=45°,CB=2,AB=2,PA=1
(1)求证:AB∥平面PCD;
(2)求证:BC⊥平面PAC;
(3)若M是PC的中点,求三棱锥C﹣MAD的体积.
按课文内容填空
____在前面带路,____吹向我们。我们像____一样,来到____里,来到____上。
Tom seldom, ______, paid for the software on his computer. That is, he used lots of pirated software.
仔细观察甲、乙两图,回答问题