胶州湾属于()海湾。A、基岩侵蚀湾 B、河口湾 C、构造湾 D、火山口湾

题型:单项选择题

问题:

胶州湾属于()海湾。

A、基岩侵蚀湾

B、河口湾

C、构造湾

D、火山口湾

考点:海洋知识竞赛海洋知识海洋知识题库
题型:单项选择题

读下图,据此回答1~4题:

1.目前我国境内已知最早人类的发现地是[ ]

A.①

B.②

C.③

D.④

2.黄河流域原始农耕文化中,最具代表性的文化遗址位于 [ ]

A.①

B.②

C.③

D.④

3.遗址②位于浙江余姚,是我国长江流域原始农耕文化的代表。它是[ ]

A.北京人遗址

B.河姆渡遗址

C.山顶洞人遗址

D.半坡遗址 

4.假如你生活在距今约7000年前②这一地区,将不会遇到的情况是[ ]

A.种植水稻

B.使用磨制石器

C.住半地穴式的房子

D.用陶器装粮食

题型:单项选择题

1997年,科学家将动物体内的能够合成胰岛素的基因与大肠杆菌的DNA分子重组,并且在大肠杆菌中表达成功。请据下图回答问题。

(1)此图表示的是采取_________基因的方法获取__________基因的过程。

(2)图中①DNA是以__________为模板,形成单链DNA,在酶的作用下合成双链DNA,此过程叫___________。从而获得了所需要的基因。

(3)图中②代表的是___________,在它的作用下将质粒(环状DNA)切出_________末端。

(4)图中③代表_________DNA含_________。

(5)图中④表示将_________。⑤表示__________DNA随大肠杆菌的繁殖而进行__________。

题型:单项选择题

中卸烘干磨系统,2/3的粗粉回()

A、粗磨仓

B、烘干仓

C、细磨仓

题型:单项选择题

I got a job teaching special education at a school in Coachella, California, a desert town about 170 miles from home. It was no (1) job. Street gangs (2) around the school after dark."Be careful," Dad warned me during one of my frequent weekend (3) home. He was concerned about my living (4) , but I needed to be on my own.One evening, I stayed after school to rearrange my classroom. (5) , I turned out the light and closed the door. Then I (6) toward the gate. It was (7) ! I looked around. Everyone had gone home.After (8) all the exits, I found just enough (9) to squeeze under a gate in the back of the school. Then I walked toward my car, parked in a field behind the building.Suddenly I heard voices. I (10) around and saw at least eight boys following me. (11) my pace, I reached into my shoulder bag to get my key. I (12) all over the inside of my handbag. But the key wasn’t (13) ! Dear Lord, please help me, I prayed (14) . Suddenly, my fingers touched a loose key in my purse. I didn’t even know if it was for my car, but I took it out and (15) it. It worked!I opened the door, slid in and locked it—just (16) the teenagers surrounded the car. Trembling , I started the engine and (17) away. When I returned to my apartment, the phone was ringing. It was my Dad. I didn’t tell him about my experience; I didn’t want to (18) him. "Oh, I forgot to tell you!" He said, "I had a(n) (19) car key made and slipped it into your purse—just (20) you ever need it.

第(8)空应选择()

A.checking

B.searching

C.trying

D.following

题型:单项选择题

对组织配型要求十分严格的移植手术为

A.干细胞移植
B.肾移植
C.角膜移植
D.肝脏移植
E.皮肤移植

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