问题 不定项选择题

关于自发反应的叙述正确的是 [ ]

A.常温下的自发反应一定是不需要条件就能自发的反应,因此氮气和氢气合成氨气的反应在常温下不能自动发生

B.常温下自然界发生的任何反应都是自发反应,光合作用是自发反应

C.电解水在通常状况下是非自发反应,因此水在任何条件下生成氢气和氧气均为非自发反应

D.某个反应是放热、熵增大的反应,该反应一定能自发进行

答案

BD

单项选择题
阅读理解

B

The centerpiece of curling(冰壶)is the curling stone, which has been called a “geometrical masterpiece of tooled geology (地质). ” Kays of Scotland has been making curling stones since 1851, when William Kay and his sons Andrew and Thomas set up a workshop in Mauchline, Ayrshire , in southwest Scotland. Kays is still owned by the relatives of the founder, and today it is the only curling stone maker left in Scotland.

Used in a highly competitive sport, the curling stones are made to exact standards. First, stones are sliced and then into round “cheeses”. Finally , the cheeses are shaped and polished into curling stones in a series of precise steps.

Each stone must weigh 44 pounds. Each must have a maximum diameter (直径) of 36 inches. Polishing is done by hand on a wheel using water, diamond-talcum power, and felt. Finishing the stone’s “running edge” is done entirely by hand with a special kind of paper and a digital measure and magnifying glass (放大镜). Lastly, a handle is fitted into holes on the top of the stone. Stones are computer-matched into pairs. Sixteen stones -8pairs-are needed for a game, and since curling game field usually have 6 lanes, each game field needs 96 matched stones!

Kays is a small firm, employing than ten skilled workers. Master craftsman and co-owner James Wyllie is skilled at all phases of curling stone making and is also an enthusiastic curler, as well as active member of Mauchline’s Burns Club, which meets regularly to honor well-known Mauchline residents.

59.What IS true about Kays?

A.It is a family business.            B.It’s a brand of curling stones.

C.It’s a place in Scotland.                     D.It’s the name of a curling stone dealer.

60.How many curling stones are needed for two games happening at the same time?

A.8.                           B.16.                  C.32.               D.96.

61.Which of the following shows the right process of making a curling stone?

A. Slicing—shaping—polishing. 

B.Weighing—measuring—polishing.

C. Cutting—running—edging—computer—matching

D. Cutting—measuring——shaping——polishing