下图为物质循环简图,A为生产者,B为消费者。下列叙述错误的是
A.①过程是光合作用
B.⑤过程可以有分解者参与
C.⑥过程代表消费者的呼吸作用
D.本图涉及碳和水的循环
答案:C
— Come and join us, Betty!
— I’m afraid I can’t. I’m too busy now. If I ______ time, I would certainly go.
A.have
B.have had
C.will have
D.had
下列反应中,不属于置换反应的是( )
A.Fe+CuSO4═Cu+FeSO4
B.Mg+H2SO4═MgSO4+H2↑
C.CO+CuO △ . Cu+CO2
D.H2+CuO △ . Cu+H2O