下列各句中，划线的成语使用恰当的一项是（   ）

在$△ABC$中，$\overrightarrow{AB}=(\cos {18}^{°},\cos {72}^{°}),\overrightarrow{BC}=(2\cos {63}^{°},2\cos {27}^{°})$,，则$△ABC$面积为（   ）

⑴____ Where are my glasses, Mum?

⑵____ Are they in your bedroom?

⑶____ Is your sister in her bedroom?

⑷____ Who's in the living room?

⑸____ What can you see in Zoom's room?

A．No，they aren't.They are in the kitchen.

B．I can see a bed，a desk and a big sofa.

C．They are on the fridge.

D．My father and my mother are in the living room.

E．Yes，she is.She is in her bed now.)

纵观人类发展历史，我们就会发现任何社会都存在一些不公平的现象，这是因为公平总是受到（    ）