A:In order to
B:So as to
C:In order not to
D:So as not to
Housing prices ________ since the end of the last year. Therefore, it's time the central government ________ some effective measures to bring them under control.
设l、m是两条不同的直线,α、β是两个不同的平面,给出下列5个命题:①若m⊥α,l⊥m,则 l∥α;②若m⊥α,l⊂β,l∥m,则α⊥β;③若 α∥β,l⊥α,m∥β,则l⊥m;④若 α∥β,l∥α,m⊂β,则l∥m;⑤若α⊥β,α∩β=l,m⊥l,则m⊥β.其中正确命题的个数是( )