质好牛肉（）肉质结实有光泽。
A、色深红
B、哑色
C、色泽鲜
D、发红白色
参考答案：C
— Does Jenny buy _________ for you? — Yes, she does.[ ]
A. some thing
B. something
C. anything
D. somethings
设等差数列{an}的公差为非零常数，且a1=1，若a1，a3，a13成等比数列，则公差为[ ]
A．1
B．2
C．3
D．5
