A:用15°的放大镜看25°的角,角变成40°
B:用四舍五入法得到的数比原数小
C:所有的梯形都有无数条高
“森林浴”和“有氧运动”是有益于健康的活动,下列有关说法错误的是( )
—Hi, Bob! What's going on over there?
—Oh, Tom and Dick are playing chess, with a crowd of students watching them.