一I'm leaving for London tomorrow, Joss.一（).

I am really （) your reasons for leaving home and wandering about in the street.

I was about _______the office when the telephone rang.

Personally I have no _______ to your leaving at once.

质量为m的质点在质量为m0的质点（视为固定)的引力场中以m0为中心做半径为r0的周期运动。若给m以沿径向的冲量I，并设I与质点的原动量之比为一小量，求m在以后运动过程中径矢的最大值r2与最小值r1，并证明在忽略二级以上小量的情况下，r2－r0≈r0－r1，即质点m的运动轨道近似为一偏心的圆。

请帮忙给出正确答案和分析，谢谢！

一梯形断面渠道，已知通过流量Q=5 m3／s，边坡系数m=1.0，粗糙系数n=0.02，底坡i=0.0002，试按水力最优条件设计此渠道断面。

请帮忙给出正确答案和分析，谢谢！

一梯形断面明渠，要求流量Q=1 m3／s，底坡i =0.0022，边坡系数m=1，粗糙系数n=0.03，若允许流速[v]max=0.8m／s，试求梯形断面底宽b和水深h。

请帮忙给出正确答案和分析，谢谢！

读音完全正确的一组是（)
A.提供(gōng) 恶劣(luè) 尽(jǐn)量
B.着(zháo)慌 勉强(qiǎng) 友谊(yí)
C.拘束(shù) 乘(chéng)机 薄(bó)礼
D.削(xuē)弱 擂(lèi)鼓 一模(mú)一样

请帮忙给出正确答案和分析，谢谢！

下列词语中，划线字读音有错误的一项是（)

Time spent in a bookshop can be enjoyable. If you go to a __21__ shop, no assistant will come near to you and say, "Can I help you？" You needn't buy anything you don't want. You may try to find out __22__ the book you want is. But if you fail, the assistant will lead you there and then he will go away. It seems that he is not interested in selling any book at all.
There is a story which tells us about a good shop. A medical student __23__ a very useful book in the shop, but it was too expensive for him to buy. He couldn't get it from the library, either. So every afternoon, he went there to read __24__ at a time. One day, however, he couldn't find the book from its usual place and was leaving when he saw an assistant signing to him. To his surprise, the assistant pointed to the book __25__, "I put it there so as not to be sold out," said the assistant. Then he left the student to go on with his reading.
21)、
A.found
B.in a corner
C.where
D.good
E.a little
22)、
A.found
B.in a corner
C.where
D.good
E.a little
23)、
A.found
B.in a corner
C.where
D.good
E.a little
24)、
A.found
B.in a corner
C.where
D.good
E.a little
25)、
A.found
B.in a corner
C.where
D.good
E.a little

英译汉：I'm thinking about a visit to Paris.

—（)— Why not stay for another cup of tea？