牛乳中的（ ），可促进钙和铁等无机物的吸收。A．酪蛋白 B．乳糖 C．脂肪

阅读理解。

Book: Princess Pip's Holiday(Hardcover) By Sally Prue Quantity Kind     Price for each book 4   new           $ 57.23 56  used          $ 23.56 Book: The King of Football (Paperback) By Tony Bradman Quantity Kind   Price for each book15 15    new             $ 10.5656         56    used            $ 6.78     5     collectible     $ 9.56 Book: The Ghoss Ship (Paperback)             By Martin Waddell Quantity Kind      Price for each book 8   new             $ 36.12 Book: My Friend, Mandela (Paperback) By Denis Herbstein Quantity Kind  Price for each book new 30    new             $ 35.67 26    used            $ 19.78 15    collectible    $ 20.97

1. Who is the author of the book My Friend, Mandela?

A. Sally Prue.         B. Denis Herbstein.     C. Tony Bradman.       D. Martin Waddell.

2. The price of the used book is at least _______.

A. $ 23.56     B. $ 19.78     C. $ 6.78     D. $ 15.27

3. Which collectible book is the most expensive one?

A. Princess Pip's Holiday.       B. The Ghost Ship. C. The King of Football.           D. My Friend, Mandela.

4. How many books of The King of Football are there on sale?

A. 25.         B. 89.         C. 35.         D. 76.

5. If you want to buy a used The Ghost Ship , you will save _______.

A. $ 15.27    B. $ 6.78    C. $ 20.85   D. $ 23.56

If you want to buy a used The Ghost Ship , you will save        .
A. $ 15.27   B. $ 6.78   C. $ 20.85  D. $ 23.56

把命题“对顶角相等”改写成：如果______，那么______．

下列哪项不属于高频电疗法（）。

A.共鸣火花疗法

B.超短波疗法

C.高压交变电场疗法

D.微波疗法

E.毫米波疗法

2 5 里面有______个 1 5 ，有______个 1 10 ，有______个 1 20 ．

在来料加工和补偿贸易中常使用（）

A.循环信用证

B.对开信用证

C.对背信用证

D.预支信用证