[填空题]It is a (regret) ______ thing to make another person suffer.

[填空题]It is a (regret) ______ thing to make another person suffer.

[单项选择]Another thing to remember in connection with concrete is that you are not allowed very much leeway for errors in either measurements or location. Once you have a solid mass of concrete set in place, it is going to stay there. You have a difficult job ahead of you if you try to remedy a mistake. Make very sure, before you fill the form, that everything is where and how you want it. There are numerous rules regarding the proper mixing handing, and finishing of concrete, but the essential one concerns the amount of water to use. The less water in the mix, the less the finished job will shrink. The less water used, the harder and more enduring the job after it has set. The amateur concrete worker is plagued with two desires. One is to use enough water to have the concrete nice and soft and easy to push around. You have been warned against that. The second is to take off the wooden forms too early, to see what the job looks like. That is really fatal. If the forms are stripped off t
A. Concrete and Its Uses
B. Rules for Working with Concrete
C. Concrete, the Homeowner’s Joy
D. Concrete, a Test of Character

[单项选择]Knowledge is power. But there is another thing we must remember. An intelligent mind needs a strong body to make it most useful.
There are a great many good exercises for building up our bodies. Many of them may be done indoors in rainy weather. Indoor exercises, however, are never as helpful as those taken out of doors because in the open air there is more oxygen. The air in the house is not fresh. But out of doors it is very fresh, especially in the morning.
But what shall we play There are a number of games such as football, basketball, races... Any game with plenty of exercises is good.
Do not neglect(忽略) your health. It is of as much importance as your mind. Our country now needs people with creative minds, good judgement, and healthy bodies.
One who has an intelligent mind is ______.
A. very strong
B. healthy
C. very clever
D. stupid

[单项选择]Another thing an astronaut has to learn about is eating in space. Food is weightless, just as men are.
Food for space has to be packed in special ways. Some of it goes into tubes that a man can squeeze into his mouth. Bite-sized cookies are packed in plastic.
There is a good reason for covering each bite. The plastic keeps pieces of food from travelling in the spaceship. On the earth very small pieces of food would simply fall to the floor. But gravity doesn’ t pull them to the floor when they are out of the plastic in a spaceship. (78) They move here and there and can get into a man’ s eyes or into the spaceship’ s instruments. If any of the instruments is blocked, the astronauts may have trouble getting safely home.
As astronauts travel on longer space trips, he must take time to sleep. An astronaut can fit himself to his seat with a kind of seat belt. Or, if he wants to, he can sleep in a sleeping bag which is fixed in place under his seat. But be careful he mu
A. walk just as they do on the earth
B. not eat anything because it’ s dangerous
C. control the spaceship when they are sleeping
D. not litter small things or it will make trouble