实物剖面挑取（）岩样，够用即可。
A.大量
B.少量
C.适量
D.混合
参考答案：C
Of all the girls, Jenny was ______ because she got the first prize.
A．more exciting
B．the most exciting
C．more excited
D．the most excited
水泥或混凝土中碱含量的含义是。（）
A.K20+Na20
B.K20+0.658Na20
C.K2O+0.685Na20
D.Na20+0.658K2O
