若一个三角形三个内角度数的比为2︰7︰4，那么这个三角形是 [ ]
A.直角三角形
B.锐角三角形
C.钝角三角形
D.等边三角形
答案：B
— What ___________ you usually ___________ on Sundays?
— I usually watch TV at home. But last Sunday I ___________ to the park with my friends.[ ]
A. did, do, goes
B. do, do, want
C. do, does, went
D. do, do, went
智力测验的可靠性是
A．信度
B．效度
C．常模
D．智商
