将螺纹轴线竖直放置，螺旋线自右向左逐渐升高的是（）螺纹，连接螺纹大多是（）旋螺纹。
参考答案：左；右
We can no longer ________ to consider water an almost free resource that we can use as much as we like.
A．permit
B．afford
C．expect
D．offer
下列情形中属于民事法律事实的是
A．爱情
B．非法同居
C．呓语
D．登记
