我深深体会到:①要学好功课,是否认真听课是关键。②上课时只有集中注意力,就能把握重点,攻破难点。③以前,有时老师讲到什么地方都不知道,我上课常搞小动作,思想开小差。④身在课堂,心在操场,可能学不好功课。
A.①句删去“是否” |
B.②句“就”改为“才” |
C.③句“思想开小差”与“小动作”对调 |
D.④句“可能”改为“必定” |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2