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问题 解答题

用短除法求下面各组的最大公因数和最小公倍数．

35和20

40和80

39和52

17和51．

答案

所以35和20的最大公因数是5，最小公倍数是5×7×4=140；

所以40和80的最大公因数是2×2×2×5=40，最小公倍数是2×2×2×5×2=80；

所以39和52的最大公因数是13，最小公倍数是13×3×4=156；

所以17和51的最大公因数是17，最小公倍数是17×3=51．

阅读理解
根据短文内容，判断正(T)误(F)。
Dear Jane,
     After I left Paris I spent two days in New York. I got to Miami on Nov.13rd. The weather
is wonderful here. This morning, I met Jennifer Lopez--my favorite movie star. I asked her to
take a picture with me. You know, that was my dream. She agreed! I'm going to show you!
                                                                                                                                         John

Dear Dad,
      I got here at last after 18 hours on a train! It's very cold here in Moscow. It's white everywhere.
This afternoon I went to have a look at the city. I got lost. I'm glad I took Russian lessons in my
university. They helped me a lot. I think I can finish my work here and go back home soon.
     I miss the warm sunshine at home. See you soon.
                                                                                                                                        Max

Dear Amy,
     I arrived in Guilin yesterday. What a beautiful place! The people here are kind and I have some
new friends. Guess who I met here! Tom, my high school classmate. He showed me around the city.
I bought a special bag made in Guilin for you and a silk table cloth for mom. Tomorrow evening I'm
going to fly to Beijing.
                                                                                                                                  Love,
                                                                                                                                  Maria
(     )1. Maria had a good time in Guilin.
(     )2. Maria went to see her classmate in Guilin.
(     )3. It was warm in Max's hometown, but it was cold in Moscow.
(     )4. John was very glad that his dream of going to Paris came true. 
(     )5. Max speaks a little Russian.
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多项选择题

用普通混凝土做屋面防水层时，胶凝材料水泥宜用（）。

A.普通硅酸盐水泥

B.硅酸盐水泥

C.矿渣硅酸盐水泥

D.火山灰水泥

E.粉煤灰水泥
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