D
Try rubbing (摩擦 ) the tip of your finger backwards and forwards very quickly on your coat or a blanket. It should become hot. In cold weather we sometimes rub our hands together to make them warm. The rubbing of two together which causes heat is called "friction"(摩擦力). In the same way, people who lived in caves rubbed a piece of wood shaped like a pencil on another piece of wood with dried leaves or grass packed nearby. The heat set the leaves or grass alight. This was a difficult way of making fire. Better ways were found by using flint(火石),but it was not until 1827 that the first matches were made in England.
Chemists made up a mixture and put it on an end of a stick or match. The mixture contained a small amount of phosphorous (磷),a chemical that bursts into flame when heated slightly. The other chemicals then caught fire and burned less fiercely until the wood was alight. By rubbing the end of the match, on sandpaper, the friction easily set the phosphorous alight. These first matches could also be struck on other rough surfaces, including the leather sole(底)of a shoe.
At the time, everyone thought this was a wonderful invention. Unfortunately accidents happened. A whole box of matches would suddenly catch fire if it was heated. Imagine this happening to someone warming themselves by a fire with a box of matches in his or her pocket! Even loose matches in a handbag or pocket could rub together and catch fire.
What was needed was a match that would only light if struck on a special surface. In 1852,the safety match was invented in Sweden. No phosphorous was used in the match head-it was put on the outside of the matchbox instead. This made it impossible for the match to light unless it was rubbed along the box on the special surface which contained sandpaper mixed with a little phosphorous.
33. Why did people use dried leaves or grass to pack another piece of wood?
34. What did the chemists make the match of in 1827?
35. If we used the safety match, we could see
本题为逻辑推理题，dried leaves 干树叶；be easy to be alight 易燃；根据以上解题思路，使用干树叶的原因一定是因为它们easy to be alight.故选项A正确。
根据原文“In the same way, people who lived in caves rubbed a piece of wood shaped like a pencil on another piece of wood with dried leaves or grass packed nearby. The heat set the leaves or grass alight.“可知，最初在摩擦生火中使用干树叶的原因肯定是因为干树叶易燃。
逻辑推理致错。
本题信息概括归纳题，第一代火柴的主要成分是磷，木头和砂纸。故选项C正确。
根据原文“Chemists made up a mixture and put it on an end of a stick or match. The mixture contained a small amount of phosphorous (磷),a chemical that bursts into flame when heated slightly. The other chemicals then caught fire and burned less fiercely until the wood was alight. By rubbing the end of the match, on sandpaper, the friction easily set the phosphorous alight. These first matches could also be struck on other rough surfaces, including the leather sole(底)of a shoe.” 可知，1827年，第一代火柴产生了，它的主要构成包括phosphorous 磷，wood 木头和sandpaper 砂纸。
信息提取错误。
本题信息提取题，safety n.安全，put on the outside of the matchbox 被放在火柴盒外面；。所以当人们使用安全火柴时，火柴放在里面，而火柴盒的表面特殊部分会放上砂纸和磷。
根据原文“In 1852,the safety match was invented in Sweden. No phosphorous was used in the match head-it was put on the outside of the matchbox instead .” 可知，1852时，安全火柴已经发明了出来，主要方法是将成分磷放到了火柴盒包装外面。
文意理解不到位致错。