下列各句中没有歧义的一句为()。
小芳和爸爸、妈妈三人玩跷跷板，三人的体重一共为150千克，爸爸坐在跷跷板的一端，体重只有妈妈一半的小芳和妈妈一同坐在跷跷板的另一端，这时，爸爸的那一端仍然着地，则小芳的体重应小于：()。
Gene: Shall I open this window?
Jodie: ______
Physics is the present day equivalent of ____ used to be called natural philosophy, from ____ most of present day science arose.
I long to alleviate __________, but I cannot.
Every means ____ tried out but never with success, as far as my knowledge goes.
____ is no reason for discharging her.
We all found_____ to play the game.
Some concepts may be difficult to grasp chiefly because they may be unfamiliar or _____ideas, opinions which we already hold.
The minister of finance is believed _____ of imposing new taxes to raise extra revenue.
He was lured into a crime he would not ____________have committed.
My sister wasn't in Paris last month ,so you _____her there.