abcd固定在匀强磁场中，磁感线的方向与导线框所在平面垂直，规定磁场的正方向垂直纸面向里，磁感应强度B随时间变化的规律如图所示．若规定顺时针方向为感应电流I的正方向，下列各图中正确的是（ ）
﹣﹣﹣Is that your headmaster？
﹣﹣﹣You mean the man ______ blue？（ ）
A．onB．withC．in
There ______ a large bowl of jiaozi on the table．（ ）
A．isB．areC．be
﹣Karl Marx is a great thinker． Do you know ？
﹣In 1818．（ ）
A．where he was from
B．when he was born
C．how he learned foreign languages
Yuan Longping is a Chinese rice scientist is leading a search to develop "sea rice"．（ ）
A．whoB．whichC．whom
Grandma wants to watch the program legal Report． Please the TV．（ ）
A．turn offB．turn onC．turn down
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