下列分子中所有原子一定处于同一平面的是（ ） A．CH3CH2CH=CH2 B．

Mrs. Black lives in a small village. Her husband is dead. Her son, Jack, lived with her. He worked in a shop in the village, but then he found a job in town named Green Sea. He went to live there. Mrs. Black was very angry. She got on a train and went to see her son. Then she said to him, "Jack, why do you never telephone me?"

Jack laughed, "But, mother, you haven’t got a telephone. "No." She answered, "I haven’t, but you have got one. "

（ ）1. The old Black ______.

A. is dead          B. lives with his wife

C. went to a small village            D. worked in a shop

（ ）2. Jack lived with his mother ______he worked in the village.

A. before        B. when              C. after     D. so

（ ）3. Green Sea is _________.

A. a big city    B. a small village    C. a town    D. a man’s name

（ ）4. Jack didn’t phone his mother because ______.

A. he had no phone                     B. he was very busy

C. his mother had no phone             D. he went home every day

（ ）5. Jack’s mother was very angry because ______.

A. Jack didn’t want to ring her up

B. Jack had a telephone but she hadn’t

C. she didn’t know how to make a telephone

D. she didn’t know she couldn’t be called

Girlbert综合征

设计模式的概念最早是由美国的一位计算机专家提出的。

Re-handling can save cost and improve service, Is it true or not? （）

A. Wrong

B. Not total true

C. True

D. Not clear here

染色体组