Some people seem to think that sports and games are unimportant. They like to watch TV at home, go to the cinema, or sleep. (21) in fact sports and games can be (22) great value, especially to people who work with their brains (23) of the day.
Sports and games should not be treated only as amusements (娱乐活动). They can (24) our bodies, prevent us (25) getting too fat, and keep us healthy. But these are not their only uses. They give us valuable practice (26) helping the eyes, brain and muscles (肌肉) to work together. In table tennis, the eyes can see the ball (27) , judge its speed and direction, and pass this information (28) to the brain. The brain then has to decide what to do, and sends its orders to the muscles of the arms, legs, and so on, (29) the ball is met and hit back (30) the player wants it to go. All this must happen (31) a very quick speed, and only those (32) A. so as to B. so that C. in order to D. so
[多选题]对于各标示牌、围栏等的设置要求,下列描述正确的是:( )。—— A. 安全围栏、标示牌的设置必须完整、可靠、醒目。在安全围栏的适当地点悬挂标示牌。 B. 安全围栏设置大小应依据作业性质、作业人员活动区域、高空坠落范围半径等因素综合考虑。 C. 安全围栏只能预留一个出入口,设在临近道路旁边或方便进出的地方,出入口应尽量远离作业点,其大小可根据工作现场的具体情况而定,一般以5m为宜。在出入口处悬挂“在此工作!”、“从此进出!”标示牌。 D. 高压配电设备做耐压试验时应在周围设围栏,围栏上应向外悬挂适当数量的“止步,高压危险!”标示牌。
