In Britain, people usually begin their talks with____. For example, they will say” It's a fine day, isn't it?” “Do you____ it will rain?”

    Many people believe that they are____ to tell what the weather will be like. But they never____with each other. One man may say, “How cloudy (阴的) it is now! It's going to rain.”____ man will say, “No, it's going to be fine later.”

    People always hope the weather they want. For____, when a farmer needs water, he looks for something to tell him it's going to____. When a man wants to travel, he is sure the weather will be ____ quickly.

    Now almost everyone____ to the weather report. It doesn't always tell us the weather we want, it only tells us what the weather will be ____. But sometimes it makes mistakes(错误).

如图所示，取一只一次性纸杯，在杯底中央扎一个小孔，用一层塑料薄膜蒙住杯口，将小孔对着窗外远处的景物，在薄膜上观察到窗外景物的像是(    )

如图所示，当歼﹣15舰载机起飞离开“辽宁舰”后，“辽宁舰”所受到的浮力将____ ，以舰载机为参照物“辽宁舰”是____的．

如图所示，质量为M，半径为R，内壁光滑的半球形容器静止在粗糙水平地面上．O为球心．有一劲度系数为k的轻弹簧一端固定在半球底部O′处，另一端与质量为m的小球相连，小球静止于P点．已知地面与半球形容器间的动摩擦因数μ，OP与水平方向的夹角为θ=30°，下列说法正确的是（   ）