文档介绍：2019年6月英语六级（第3套）
Part I Writing (30 minutes)
Directions: For this part, you are allowed 30 minutes to write an essay on the importance of team spirit
and communication in the should write at least 150 words but no more than 200 words.
Part Ⅲ Reading Comprehension (40 minutes) Section A
Questions 26 to 35 are based on the following passage.
Steel is valued for its reliability, but not when it gets cold. Most forms of steel 26 become brittle
(脆的) at temperatures below about -25℃ unless they are mixed with other metals. Now, though, a novel
type of steel has been developed that resists 27 at much lower temperatures, while retaining its
strength and toughness - without the need for expensive 28 .
Steel's fragility at low temperatures first became a major concern during the Second World War. After
German U-boats torpedoed (用鱼雷攻击) numerous British ships, a 2700-strong fleet of
cheap-and-cheerful“Liberty ships”was introduced to replace the lost vessels, providing a lifeline for the
29 British. But the steel shells of hundreds of the ships 30 in the icy north Atlantic, and 12 broke in
half and sank.
Brittleness remains a problem when building steel structures in cold conditions, such as oil rigs in the
Arctic. So scientists have 31 to find a solution by mixing it with expensive metals such as nickel.
Yuuji Kimura and colleagues in Japan tried a more physical 32 Rather than adding other metals,
they developed a complex mechanical process involving repeated heating and very severe mechanical
deformation, known as tempforming.
The resulting steel appears to achieve a combination of strength and toughness that is 33 to that
of modem steels that are very rich in alloy content and, therefore, very expensive.
Kimura's team intends to use its tempformed steel to make ultra-high strength parts, such as bolts. They
hope to reduce both the number of 34 needed in a construction