伤寒腹胀患者禁食（）. A.牛奶 B.鸡蛋 C.肥肉 D.鱼虾 E.煮白菜

句型转换。

1. He started to learn the piano when he was five years old.

    He started _____ the piano at the _____ of five. (同义句)

2. He was first in the competition.

    He _____ first prize in the competition. (同义句)

3. I took part in the school football team last year.

    I _____ the school football team last year. (同义句)

4. He hiccupped for 69 years and 5 months. (对画线部分提问)

     _____ _____ did he hiccup?

5. I was born in Beijing,  in 1988. (对画线部分提问)

     _____ and _____ were you born?

6. I think there is something wrong with his plan. (改为否定句)

    I _____ think there is _____ wrong with his plan.

哪种说法是正确的

A.骨髓基质中的吞噬细胞是放射性胶体骨髓显像的靶细胞

B.骨髓中的红细胞生成细胞是放射性胶体骨髓显像的靶细胞

C.骨髓中的粒细胞生成细胞是放射性胶体骨髓显像的靶细胞

D.骨髓中的血小板生成细胞是放射性胶体骨髓显像的靶细胞

E.骨髓中的淋巴细胞是放射性胶体骨髓显像的靶细胞

目前，越来越多的超市开始销售有机蔬菜，这些蔬菜的价格要比普通蔬菜贵好几倍。这意味（）

①有机蔬菜的高质量决定其价格

②有机蔬菜市场是买方市场

③有机蔬菜的价值量比普通蔬菜大

④生产者可能会扩大有机蔬菜的生产规模

A.②③

B.③④

C.①④

D.②④

有线电视系统的架空电缆和墙壁电缆引入地下时，在距地面不小于（）m的部分应采用钢管保护；钢管应埋入地下0.3～0.5m。

A、1.5

B、2.0

C、2.2

D、2.5

提高混凝土的抗冻性可采取哪些措施？