临街坡地住宅的建筑常用的处理方式为（）。 A.跌落 B.掉层 C.天桥 D.错叠 E

一（个）、十、百、千、万……都是[ ]

A 、数位         B 、个级           C 、计数单位

阅读理解。

     Bob is six years old. He is old enough to go to school. On the first day, his teacher taught him three

words, "I, you, he". Then the teacher said, "I am your teacher. You are my student. He is your student. He

is your classmate."When school was over, Bob went home. His mother asked him, "What has your teacher

taught you today?" Bob said with a smile, "Listen, Mum and Dad, I am your teacher. You are my student. He

is your classmate." His mother said,  "No,dear. You're wrong." Then she said, "I am your mother. You're my

son. He's your father. "The next day, Bob's teacher asked Bob to make sentences with "I, you and he".

     Bob stood up and said, "I'm your mother. You're my son. He is your father. "All the students in Bob's

class laughed.

1. Who taught Bob new words in the school?

A. Bob's teacher

B. Bob's friends

C. Bob's father

D. Bob's mother

2. How many words did the teacher teach?

A. Two.

B. One.

C. Four.

D. Three.

3. Did Bob understand what his teacher taught him?

A. Yes, he did.

B. No, he didn't.

C. No, but he understood what his mother said.

D. The writer doesn't tell.

4. What do you think of the boy?

A. He is not clever.

B. He is helpful.

C. He is polite.

D. He is kind.

5. Who laughed in the class the next day?

A. Bob's mother.

B. Bob's classmates.

C. Bob's teacher.

D. Bob's father.

2010年8月25日，经权威遗传机构确认济南发现的一例染色体异常核型即46，XY，t(6；8)为世界首报，该例异常核型属于染色体平衡易位携带者。染色体平衡易位是造成流产和畸形儿的重要因素，由于没有遗传物质丢失，患者表观及智力均与正常人一样。某女性患者的第1和5号染色体易位，染色体异常核型可表示为46，XX，t(1；5)。下列说法错误的是[ ]

A．经染色后，在光学显微镜下可观察到染色体易位

B．46，XY，t(6；8)表示某男性患者第6和8号染色体易位

C．只有缺失和重复这两类染色体结构变异才能导致基因数量的改变

D．染色体易位不属于基因重组，这种变异是可遗传的

一般来讲潜艇下潜的深度极限在多少米？（）

A、300~600米

B、600~800米

C、900~12000米

D、1200米

运行式浮动床停运落床的方法有（）等落床法。

A.重力

B.空气

C.排水

D.压力