如图(不计绳重与摩擦，且动滑轮重G动小于物重G)，用它们分别将重相同的甲、乙两物体匀速提升相同的高度，所用的拉力分别为F甲、F乙，它们的机械效率分别为η甲、η乙．则下列关系正确的是：
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A． F甲＜F乙 B． F甲＞F乙
C． η甲＜η乙 D． η甲 = η乙
How do you get on with_____ little brother？I've just had a baby sister I'm worrying about it．（ ）
A．myB．hisC．herD．your
Why do people never cut up the _______________ on their birthdays？
Because they are a symbol of long life．（ ）
A．eggsB．cakesC．noodlesD．dumplings
__________is your father？
He's an engineer in a big factory．（ ）
A．WhoB．WhatC．WhichD．Where
Will you stay for _________ supper with us？
Sure，I'd love to．Home cooking is just what I like．（ ）
A．aB．anC．theD．/
Excuse me．I'd like to take exercise but I'm new here．Could you please tell me___________？
Follow me．I'll take you there．（ ）
A．how I can get to the airport
B．where the supermarket is
C．How to get to the police station
D．which is the way to the sports center