同样重的实心铜块和实心铁块，都浸没在煤油中，这时____（选填“铜”或“铁”）块受到浮力大．同样重的实心铜块和实心铁块，铜块浸没在煤油中，铁块浸没在水中，这时____（选填“铜”或“铁”）块受到浮力大．
— In the present, most of us have no enough money to afford the houses.
— Yes, they are too expensive in Shenzhen.
胰岛素主要功能是调节糖类在体内的吸收，利用和转化，从而降低血糖（血液中的葡萄糖）．下列有关胰岛素的说法错误的是（ ）
请从下面四种物质中选择恰当物质，用字母代码回答1﹣4题
A．小苏打；B．熟石灰；C．维生素；D．明矾．
I'm Chinese ，but I am in England now. I can speak English. But I sometimes make mistakes with English. It was sunny yesterday. My class went to the park. I said，“Let's fly cats in the park. ”My classmates all laughed. I didn't know why. Then my teacher said，“Cats are animals. We can't fly them. But we can fly kites. ”“I know my mistake. I wanted to say kites，not cats. ”I said. Then we laughed again. That was funny.
