People who live near the sea from the tides．In the daytime, for about six hours, the water rises higher and higher on the beach．And then it about six hours．The same thing happens again at night．There are two high tides

and two low tides every 24 hours．

Seamen on a ship tell time by looking at the moon and the stars．The whole sky is their clock．

In some places in the world the wind comes up at about the same

time every day or changes direction or stops blowing．In these places

the wind can be the clock．

A sand clock is an even better clock．If you had fine dry sand in a

glass shaped like the one in the sand will take another hour to go back again．

50．From the passage, we learn that Jerry ______ in the end．

  A．lost his interest in movies                         B．turned out to be a real gangster

  C．had his own shooting club                        D．couldn’t walk in a normal way

B

How could we tell time if there were no watches or clocks anywhere in the world?

The sun was probably the world’s first “clock”, except in the far north, where the Eskimos （爱斯基摩人） live．There, it’s dark most of the winter, and light most of the summer．But in most of the world, people have used the sun today, if you don’t have a clock that shows time, you still know that when the sun shines, it’s day, and when it’s dark, it’s night．The sun can not only tell you whether it’s day or night but also it’s morning, noon, or afternoon．When the sun is almost directly overhead, it’s noon．

49．Jerry Baldwin dropped his gun mainly because of his ______．

  A．illness                 B．anger                      C．carelessness             D．eyesight

48．How did Jerry Baldwin get a gun?

  A．He bought it for himself．                       B．He borrowed it from the club．

  C．He made it on his own．                         D．He got it to from the gangster．

47．Jerry Baldwin had a large collection of EXCEPT _____ones．

  A．Spanish               B．Japanese                 C．Russian            D．English

46．What was Jerry Baldwin?

  A．The boss of a restaurant．                        B．The manager of a cinema．

  C．The owner of a video shop．                           D．The head of a shooting club．

44．A．so                      B． and                  C．or                      D．but

43．A．got                     B．forced                 C．made                  D．allowed

42．A．held                    B．ordered               C．dropped              D．received