This movement of water is called the tide (潮汐). Tides are caused by the pull of the sun and the moon on the earth's surface; since the moon is closer, it affects the tides more than the sun. When the moon is directly overhead, it actually pulls on the water that is below it. This causes the water level to rise11. Which of the following might be the best title for the passage?

[单选题]Tides would ______if the pull of the moon equaled the pull of the sun.A． be the same height as they are nowB． be of equal height all the timeC． sometimes be higher than they are nowD． no longer be affected by the wind

[单选题]潮汐周日不等（diurnal inequality of tide）的现象为（）。A .一天有两次涨潮和两次落潮B .相邻两次高潮或两次低潮潮高不等C .涨落潮时间不相等D .一天有两次高潮或两次低潮的潮高以及相邻的高、低潮的时间间隔不相等

[单选题]We know much about the universe(宇宙). It means the earth, the sun, the moon,

[单选题]We know much about the universe(宇宙). It means the earth, the sun, the moon,

[单选题]We know much about the universe(宇宙). It means the earth, the sun, the moon,

[单选题]We know much about the universe(宇宙). It means the earth, the sun, the moon,

[单选题]We know much about the universe(宇宙). It means the earth, the sun, the moon,

_in the color of sea water from blue to green seem to be caused by high or low c

[单选题]tideA．潮汐B．海水C．淡水D．湖水

[单选题]The height of the tide is affected by all of the following EXCEPT______.A． the position of the sunB． channels in the sea bottomC． the direction of the windD． variations in the coast line