More and more people in cities want to live in the countryside because they are ______ the noisy city life.
A:tired of
B:used to
C:ready for
D:fond of
物体做直线运动的vt图象如图所示.则该物体( )
若不等式(3a-2)x+2<3的解集是x<2,那么a必须满足( )
下列各式中正确的个数为( )
①sin230°+cos260°+sin30°cos60°=34
②sin220°+cos250°+sin20°cos50°=34
③sin215°+cos245°+sin15°cos45°=34
④sin280°+cos270°﹣sin80°cos70°=34.