单选题
【正确答案】
C
【答案解析】Adding the two given equations, we get a+b+c=11d. Then
[*]
The columns are equal (C).
[*]
The columns are equal (C).
【正确答案】
A
【答案解析】Since in the given figure OA and OB are radii, each is equal to 5. With no restrictions on x,
AB could be any positive number less than 10; and the larger x is, the larger AB is. If x were 90, AB would be [*], but we are told that x＞90, so [*]
[*]
AB could be any positive number less than 10; and the larger x is, the larger AB is. If x were 90, AB would be [*], but we are told that x＞90, so [*]
[*]
【正确答案】
A
【答案解析】Column B =[*]
Since 0 ＜ x ＜ 1, x25 ＜ x.
Since 0 ＜ x ＜ 1, x25 ＜ x.