平面上有6条两两不平行的直线，求证：在所有的交角中，至少有一个角小于30.1°．

    --Well, we should ride a bike or take the bus          driving.

下列说法能体现物质物理性质的是

如图，直线a∥b，BC平分∠ABD，DE⊥BC，若∠1=70°，求∠2的度数．

① ____     A. They can play basketball.

② ____     B. They like playing ping-pong.

③ ____     C. He can ride a bicycle.

④ ____     D. I like skipping.

⑤ ____     E. He can play football.