It is difficult for a teacher to give         attention to children in a large class．We should reform the situation in order to meet each child’s needs．

A．private

B．personal

C．individual

D．single

1 mol某有机物在稀H₂SO₄作用下，水解生成2 mol相同的物质。下列物质中：

①蔗糖；②麦芽糖；③淀粉；④；

符合题意的物质可能是(　　)

A．①②⑤⑦　　　　　　　

B．④⑤⑦

C．②⑤⑥⑦

D．①④⑤⑥