----Does Ann like playing basketball?

----No, she doesn’t. She _____plays sports.

A．often

B．usually

C．once a week

D．hardly ever

下列各组物质中，由相同种类元素组成的是[ ]

A．胆固醇、脂肪酸、脂肪酶

B．淀粉、半乳糖、糖原

C．氨基酸、核苷酸、丙酮酸

D．性激素、生长激素、胰岛素