阅读理解。
The trouble with Christmas is that it comes just before the end of the year. Early in January, lots of bills
arrive. There I am, surrounded by presents, having spent all last year's salary and most of this year's, too,
when little brown envelopes start dropping through the letter box. The gas, the electricity, the telephone-lots
of pieces of paper, all asking for money.
I suppose the people who send these bills didn't want to spoil my Christmas, so they didn't send the bills
to me before 25th December. It's really very kind of them, but I wish they'd send a letter to my bank manager
explaining what is going to happen immediately after the holiday. Then he would be ready for me when I go
to see him, and it would save me a difficult fifteen minutes while I explain why I need to borrow ￡ 200 and
he tells me why I can't have it.
Next year it's all going to be different. In my house, we are going to have Christmas in July, during our
summer holiday. So next December I'll have enough money in the bank to pay all the bills. It's a wonderful
idea but the only problem is that my wife and children don't seem to like it very much..
1. The people the writer should pay ______. [ ]
A. are kind to him
B. want to spoil his Christmas
C. want to say 'Merry Christmas' to him
D. cost him more money than he can pay by sending him a lot of bills
2. At the end of the year, the writer is usually ______. [ ]
A. worried because of so many bills
B. having a sunny day
C. worried about how to spend his holiday
D. visiting his friends abroad
3. The passage tells that ______. [ ]
A. trouble sometimes comes with happiness
B. money is everything
C. no money means no happy
D. money can buy happiness
r=2Ω的金属棒L垂直于导轨放置在离R1较近的AB处，t＝0时金属棒在沿导轨水平向右的恒力F作用下由静止开始运动，当金属棒运动到尚离磁场边界CD较远的某一位置时，电压表示数变为零；当金属棒刚进入磁场区域，电压表的示数又变为原来的值，直到金属棒运动到EF处电压表的示数始终保持不变。求：
生的