Question

【題目】 A mineral is something in nature that is neither a plant nor an animal. Most rocks have two or more minerals. 【1】

First, look for color. Some minerals are light in color, while others are dark. 【2】 because many minerals have more chemicals that give them a different color.

【3】 Some minerals shine brightly. Others may look smooth. Still others may have a shining luster(光澤), like the inside of some seashells.

Third, look for how the mineral breaks apart. Some minerals come apart into thin, flat sheets. Others come into small cubes. Still others break up into pieces with different shapes.

Finally, look for hardness. 【4】 Some minerals are soft, so you can cut them with your hand. Others can be cut with a coin. Still others can be cut with a penknife.

A. Second, look for luster or shininess.

B. What can we do to discover a mineral?

C. You can discover a mineral by looking at its size.

D. You can test a mineral for hardness by trying to cut it.

E. But color is not always the best way to discover a mineral,

Answer 1

【答案】

【1】B

【2】E

【3】A

【4】D

【解析】

礦物是自然界中既不是植物也不是動(dòng)物的東西。怎么發(fā)現(xiàn)礦物質(zhì)？作者主要介紹了四種方法。尋找顏色，找光澤，看礦物質(zhì)怎么斷裂，看硬度。

【1】根據(jù)上文提及礦物質(zhì)及后文尋找礦物質(zhì)的步驟，故選B我們做什么以發(fā)現(xiàn)礦物質(zhì)？

【2】根據(jù)后文的原因because many minerals have more chemicals that give them a different color. 因?yàn)樵S多礦物質(zhì)含有更多發(fā)出不同的顏色的化學(xué)物質(zhì)，故選E但是顏色不總是發(fā)現(xiàn)礦物質(zhì)的最好方法。

【3】根據(jù)上文發(fā)現(xiàn)礦物質(zhì)的第一步First, look for color.可知這里指第二步，故選A“第二，尋找光澤”。

【4】根據(jù)上文總述Finally, look for hardness.及后文用不同工具切割不同硬度的礦物質(zhì)，故選D你可以試著切割一種礦物來測試它的硬度