无人机任务规划是实现的有效途径，它在很大程度上决定了无人机执行任务的效率（）。 A.

One day an old man is selling (卖) a big elephant. A young man comes to the elephant and begins to look at it slowly. The old man goes up to him and says in his ear, “Don’t say anything about the elephant before I sell it. Then I will give you twenty dollars.”“All right,” says the young man. After the old man sells the elephant, he gives the young man twenty dollars and says, “Now, can you tell me how you found the elephant’s bad ears?”“I didn’t find the bad ears,” says the young man. “Then why are you looking at the elephant slowly?” asked the old man. The young man answers, “Because I have never seen an elephant before, and I want to know what it looks like.”

根据短文选择正确的答案

(　 )11. ________  the elephant.

　　　 A. The young man sells     B. The old man sells

　　　 C. The two men sell        D. The old man buys

(　 )12. The young man is looking at the elephant slowly.

He wants to find out ___________.

　　　 A. which foot of the elephant is bad B. how heavy it is

　　　 C. which ear of the elephant is bad D. what it looks like

(　 )13. The young man   ______________.

　　　 A. knows the elephant has bad ears B. wants to buy the elephant

　　　 C. looks after the elephant D. gets some money from the old man

(　 )14. The young man  ______________.

　　　 A. is not interested in elephants B. knows what an elephant looks like

　　　 C. has seen some elephants before D. has never seen an elephant before

(　 )15. Hearing what the young man said, the old man will probably(很可能)be ____________.

　　　 A. angry （生气）      B. happy     C. dangerous      D. hungry

查字典。

1．我的好朋友姓___________，这个字用部首查字法先查部首________，再查_____画

2．找朋友。

影　研　帕　袭　碗　须　布　装

①部首是“巾”的字有：______________________________

②部首是“衣”的字有：______________________________

③部首是“彡”的字有：______________________________

④部首是“石”的字有：______________________________

主张“世界上除了运动着的物质之外，什么也没有”的观点，属于( )。

A．否认人的意识存在的自然唯物主义

B．主张世界统一于物质的辩证唯物主义

C．否认时间与空间存在的唯心主义

D．把人的意识理解成某种特殊的“精细物质”的机械唯物主义

轴流泵是( )的一种。

A．叶轮式

B．叶片式

C．齿轮式

D．螺杆式

在施工现场搭设了一个长6m、宽0.6m、高4.5m的现浇混凝土梁的模板，其支撑用φ48和φ51的两种型号钢管直接支撑在地面上，浇筑混凝土时，支撑下地面沉陷，模板严重变形。请判断下列事故原因分析的对错。

两种钢管混用。