Hoà tan hoàn toàn một lượng Ba vào dung dịch chứa a mol HCl thu được dung dịch X và a mol H₂. Trong các chất sau: Na₂SO₄, Na₂CO₃,Al, Al₂O₃, AlCl₃, Mg, NaOH, NaHCO₃. Số chất tác dụng được với dung dịch X là   

A. 7 

B. 4

C. 6

D. 5

six

Does Mai have long hair?

Does Lan have black hair?

My father walks in the park every morning.

He isn't doing his homework now . He is playing games.

My mother has beautiful eyes.

They aren't here.They are home.

What are Ba and his brother doing now?-They are watching television.

Look! They are running on the street .It 's dangerous.

1.hot 2.cool 3.dry 4.tropical

some nhá

bar: thanh dozen: tá

Đó chính là quả banh,quả bóng

Talking about HUE ,it is the oldest city in Central of VIET NAM .It is near DA NANG but it is more interesting than DA NANG . It aslo has the most famous river in Central VIET NAM - the Perfume River.You can take a trip on the river, and you can visit the Imperial City.In there you can find museums , galleies ,and temples.It is HUE 's greatest attraction . But cuisine - the food is really good.So it 's avery beautiful city in my country.