问题 选择题

X、Y、Z分别代表3种不同的短周期元素,X元素的原子最外层电子数为1,Y元素原子M层有6个电子,Z元素原子的L层电子数6,由这三种元素组成的化合物的化学式是

A.X3YZ4

B.X2YZ3

C.XYZ4

D.X4YZ4

答案

答案:B

根据元素的结构可知,X的最高价是+1价,Y是S,Z是O,可组成的化学式应该是选项B,其余都是错误的,答案选B。

阅读理解

Early in the 18th century, Captain Cook, a famous explorer of Australia, unexpectedly caught sight of an unusual animal during his first visit to Australia. The animal had a large mouse like head and jumped along on its large legs. To his great surprise, the unusual animal carried its young in a special pocket of flesh. Captain Cook pointed to the animal which was eating grass in the distance and asked his native guide what the animal was referred to. The guide seemed not to know that he was pointing at and finally said “Kang-a-roo”, but their requests were met with puzzled looks of the native people. Before long they got to discover that the native guide who made the answer to Cook’s question really meant, “I don’t know what you pointing at. “ Funny enough, the name “ Kang-a-roo”, stuck and it is still in use today.

小题1:Which of the following sentences best expresses the main idea?

A.captain Cook’s guide made a joke.

B.Native Australians could not speak English in Cook’s time.

C.Some words have rather funny origins (起源).

D.Captain Cook was a lover of wild animals.小题2:When the native guide said “Kang-a-roo ”, he really meant “ ______”

A.Ah, it is a special kind of animal

B.I wonder what you have said

C.What do you mean by pointing at that animal?

D.I have no idea of what you are referring to.小题3:We can infer from this passage ______.

A.we should learn many different languages

B.Captain Cook made a mistake in understanding

C.Captain Cook was a foolish explorer

D.the importance of a language in common

单项选择题