( )是保障从业人员人身安全与健康的重要措施，也是保障生产经营单位安全生产的基础。

下列词语中划线的字，每对读音都不相同的一组是 （   ）

A．圈养／终成眷属堤坝／提心吊胆作祟／崇山峻岭

B．鸟瞰／不堪一击玷污／拈轻怕重模仿／装模作样

C．禅让／潺潺流水评估／怙恶不悛搪塞／敷衍塞责

D．媲美／鞭辟入里龃龉／咀嚼品味看守／看家本领

飞机的飞行高度是1200m，上升400m，又下降300m，这时飞机高度是______m．

Please __ your bill before you pay.

A. watch          B. check               C, see                 D. look

在经济周期中，( )是商品价格猛烈下降的阶段。

A．危机阶段
B．高涨阶段
C．萧条阶段
D．复苏阶段

With the widespread use of the personal computer, many authorities in the field of (56) have pointed out the need for computer literacy.
Unfortunately, there is no (57) agreement as to what the term "computer literacy" means. Some feel that computer literacy means knowing how to make the computer "compute"; that is knowing how to program computers in one or more programming languages.
Others feel that knowing how to program is merely a small segment of computer literacy. These people (58) the major emphasis in schools should be on teaching how to effectively use the many software packages that are available.
Still others suggest that computer literacy education is not required. They suggest that computers are being so rapidly integrated into our society that using a computer will be as (59) as using a telephone or a video tape recorder, and that special education will not be necessary. (60) of one’s definition of computer literacy, it is recognized by most that learning to use a computer is indeed an important skill in modern society.

A．claim

B．deny

C．define

D．call