请从所给的四个选项中，选出最符合左边四个图形一致性规律的选项。（）
A．A
B．B
C．C
D．D
参考答案：D
解析：
奇数项图形背对，偶数项图形正对。
用于甲状腺功能检查的是（）
A.丙硫氧嘧啶
B.放射碘
C.糖皮质激素
D.甲状腺素
E.大剂量碘
In 1960, the number of students enrolled at a college was 500. In 1980, the number of students enrolled at the college was
times as great as that in 1960. What was the number of students enrolled at the college in 1980
times as great as that in 1960. What was the number of students enrolled at the college in 1980