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【单选题】
Persons who are overweight should watch their diet carefully in order to lose pounds. The best way to do this is to start a weight control program. At first it is wise to talk with your doctor. He can tell you if your health is good enough for you to try to lose weight. If you are in good health, your doctor can tell you how much weight you should lose. He can advise you of the number of calories you should have in your meals each day. He can tell you about exercising while on your diet. A good rule is to lose slowly. A loss of a pound or two a week is plenty. Plan meals around foods you know. The best diet for you is the one you can be faithful to. This means that it is wise to include foods that you are used to and that are part of your regular eating habits. Strange food may not satisfy you. They may throw you off your diet. When you have lost the weight you wish, simple items can be added to your diet so that you can maintain the weight you want. While you are dieting, try to build a pattern of eating that you can follow later to maintain your desired weight. Strange foods used on a diet may work but will be hard to continue eating afterwards. As a result, you may become discouraged and go back to the old habits that put on the extra weight in the first place. When you plan meals, follow a sound food plan. Be sure to include the daily nutrition you need. Make certain you are getting the right kinds of food. Keep busy! This way you will not be tempted to go off the diet. Take advantage of opportunities to exercise. Try walking instead of ridding whenever possible. 1. An overweight person can try to lose weight if ________.
A.
his health is good enough to do so
B.
he wants to do so.
C.
he has worked out a weight control program.
D.
he knows how many calories he should have each day.
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举一反三
【判断题】在同一条件行的不同列中输入多个条件,它们彼此的关系为逻辑与关系。
A.
正确
B.
错误
【单选题】(2004上海卷)下列离子方程式中正确的是
A.
硫化亚铁放入盐酸中      S 2- + 2 H + → H 2 S ↑
B.
硫酸铜溶液中通入硫化氢  Cu 2+ + H 2 S→ CuS↓  + 2 H +
C.
氯化铝溶液中加入过量氯水 Al 3+ + 4NH 3 •H 2 O→ AlO 2- + 4NH 4 + +2H 2 O
D.
碳酸氢铵溶液中加入过量氢氧化钠溶液 HCO 3- + OH - → CO 3 2- + H 2 O
【简答题】磁感应强度是描述磁场内____磁场强弱的物理量,而磁通是反映磁场中某个____磁场强弱的物理量。
【单选题】想一想,你如何判断一个离子方程式的正误。请小试身手,判断下列离子方程式中正确的是 [     ]
A.
将稀硫酸加入Ba(OH) 2 溶液中H + +OH - =H 2 O
B.
碳酸钠溶液与稀硫酸混合CO 3 2- +2H + =CO 2 ↑+H 2 O
C.
大理石溶解于醋酸CaCO 3 +2H + =Ca 2+ +CO 2 ↑+H 2 O
D.
澄清石灰水与稀硝酸反应Ca(OH) 2 +2H + =Ca 2+ +2H 2 O
【单选题】下列离子方程式中正确的是
A.
FeO溶于稀硝酸中:FeO+2H + = Fe 2+ +H 2 O
B.
过量CO 2 通入NaOH溶液中:OH ¯ +CO 2 = HCO 3 ¯
C.
金属钠溶于水中:Na+H 2 O = Na + +OH ¯ +H 2 ↑
D.
过量氨水加入AlCl 3 溶液中:Al 3+ +3OH ¯ = Al(OH) 3 ↓
【判断题】在同一条件行的不同列中输入多个条件,它们之间的关系为“与”关系。
A.
正确
B.
错误
【判断题】磁感应强度是描述磁场强弱的物理量,它的单位是特斯拉。
A.
正确
B.
错误
【简答题】磁感应强度是描述磁场强弱的物理量,它的单位是()
【单选题】下列离子方程式中正确的是
A.
将盐酸滴入氢氧化铜悬浊液中 H + +OH 一 = H 2 O
B.
将小苏打溶液加入醋酸中 HCO 3 - +H + =C0 2 ↑+ H 2 O
C.
将锌片投入到CuSO 4 溶液中 Zn+Cu 2+ =Zn 2+ +Cu
D.
将Fe粉投入稀硫酸中2Fe+6H + =2Fe 3+ +3H 2 ↑
【简答题】下列离子方程式中正确的是 A  H 2 SO 4 与Ba(OH) 2 溶液反应:Ba 2 + +2OH - +2H + 十SO 4 2 - →BaSO 4 ↓+2H 2 O B  Ca(HCO 3 ) 2 与过量Ca(OH) 2 溶液反应:Ca 2 + +HCO 3 - +2OH - →CaCO 3 ↓+CO 3 2 - +2H 2 O C  Na 2 CO 3 溶液中通入少量CO 2 :CO 3...
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