如图所示，分别用力F₁、F₂、F₃将质量为m的物体由静止沿同一光滑斜面以相同的加速度从斜面底端拉到斜面的顶端，在此过程中，F₁、F₂、F₃做功的功率大小关系是（    ）

一个三角形在其直观图中对应一个边长为1正三角形，原三角形的面积为（   ）

根据短文内容。选择适当的短语完成句子。    A man goes to a fast food restaurant for lunch. "Hi!" a waiter says. "Can I help you?"
    "I'd like a hamburger。French flies and a medium pizza, "says the man.
    "Anything else?'' the waiter asks.
    "No, "the man answers. "That's all. ''
    "Is that for here or taking away?" the waiter asks.
    "Taking away, "says the man.
    The man pays for his lunch. The waiter puts the man's lunch in a bag. 'The man takes the bag away.
    "Thank you!" the waiter says. "Have a nice day."
    The man walks to a park. He sits down and opens the bag. To his surprise(使他吃惊的是), there are no hamburgers in the bag. There are no French fries. There is no pizza. There is money(钱)in the bag a lot of money. The man counts the money--2, 000 dollars!
    Why is the money in the bag? The man doesn't know. Do you know? Can you guess?

A. to a park      B. a lot of money      C. the man's lunch in a bag D. "I'd like a hamburger, French fries and a medium pizza.'' E. to a fast food restaurant for lunch

计算：

选词填空。

常常      长长

①小东____去帮小红补课。

②我家门前有一条____的小河。

③小刚____因为起晚了上学迟到。