① Why not go on Tuesday? It's half price then ____     A. They are Amy's.

② What does your father do? ____     B. I can sing English songs.

③ Are you all right? ____     C. I'd like some tea.

④ How can I get there? ____     D. He is a worker.

⑤ Whose pants are these?____     E. I am l.65 metres.

⑥ How tall are you? ____     F. You can get there by bus.

⑦What can you do? ____     G. Really? Thank you.

⑧ What's the weather like in the USA? ____     H. I feel happy.

⑨ What would you like to drink? ____     I. I'm OK now.

⑩ How do you feel?____       J. It's sunny and hot.

抗雪灾中，为使道路的积雪迅速融化，使用一种融雪剂硅酸钠，化学式为Na₂SiO₃，其中硅元素的化合价为（　　）

下列说法中正确的是（   ）

在$△ABC$中,$B={60}^{°},b^2=ac$，则$△ABC$一定是(    )