患者男性，56岁，因上颌骨肿瘤拟行右上颌骨部分切除术，在外科手术前，修复医生应做的工

阅读理解。

     Jack is an eleven-year-old boy. He has a father, a mother, a grandfather and two brothers in his family. Jack is the youngest ( 年龄最小的).  One of his brothers,  Tim,  is fourteen years old. T he other brother,

Mike, is fifteen years old.  What's eleven and fourteen and fifteen? That is Jack's father John's age.  Jack's

mother is very young. She gives birth to (生下) Jack when she is twenty-five years old. Jack doesn't know his grandfather's age. He is very old but very healthy.  

根据短文内容,判断句子正(T)误(F).

( ) 1. There are seven people in Jack's family.

(     ) 2. Jack doesn't have a sister.

(     ) 3. John is thirty years old.

(     ) 4. Jack's mother is twenty-five years old.

(     ) 5. Jack's grandfather isn't old and he is healthy.

海带中含有大量的碘元素，活的海带能够吸收海水中的碘元素，这一现象主要与海带细胞中的（     ）结构有关。

A．细胞壁

B．细胞质

C．细胞核

D．细胞膜

2007年中央“—号文件”强调，要着力“推进农业科技创新，强化建设现代农业的科技支撑。根据以下材料回答题。

表1：目前中国与发达国家农业科技状况比较

借助骨缝或软骨坚实连接的是

A．胸部

B．脊柱

C．四肢

D．头颅

E．骨盆

亲表皮现象（epidermotrophism）