It was a difficult time for the relatives of Missing MH370 passengers when they heard the bad news , but they didn't ________ hope.
A:give out
B:give off
C:give in
D:give up
决定风速大小的力是( )
规定运算:a☆b=5a﹣2b,求(35☆43)☆23.
∠A=____
∠C=____
∠A=∠B=____