1.B

2.B

3.A

4.A

1. They warned to make everyone more aware of the dangers of climate change.

2. They used recycled care tyres.

3. Over 100 musicians and celebritie.

4. No, it isn't.

1.B

2.D

3.D

4.B

1.Yes,it does.

2. Because of the wires, people could not take those telephones with them when they left their homes or offices.

3. Paỵ phones are landlines found in public places.

4.The young warrios.

5. A smart phone is a cell phone that has lots of computer-style features.

Hòa tan hoàn toàn 10,8g nhôm vào 200g dung dịch Đồng II sunfat vừa đủ.Tính:

a) Nồng độ phần trăm của muối Đồng II sunfat.

b) Nồng độ phần trăm của dung dịch thu được sau phản ứng.

Nhanh nhé><