单项选择题Google doesn't restrict its search ads to its own site because______.
单项选择题The main theme of this passage is to ______.
单项选择题We can learn from the passage that the strategy of Israel is ______.
单项选择题The reason why Syria's Baath sow the dissension in Israel is that______.
单项选择题According to the passage, the one who will do most of the heavy lifting should ultimately be______.