A. They can tell you when your clothes need washing.
B. They can be controlled with a smartphone.
C. They are difficult to operate.
D. They are sold at a low price.
74. We can conclude from Samsung's statements that
________.
A. the app connection makes life easier
B. it is better to dry clothes in the morning
C. smartphones can shorten the drying time
D. we should refresh clothes back at home
75. What is the main idea of the last paragraph?
A. The laundry should be frequently checked.
B. Lazy people like using such machines.
C. Good technologies also cause problems.
D. Television may help do the laundry.
2017·全国卷Ⅱ]
B.
You may think that sailing is a difficult sport, but it is really not hard to learn it. You do not need to be strong. But you need to be quick. And you need to understand a few basic rules about the wind.
First, you must ask yourself,“Where is the wind coming from? Is it coming from ahead or behind or from the side?” You must think about this all the time on the boat. The wind direction tells you what to do with the sail.
Let's start with the wind blowing from behind. This means the wind and the boat are going in the same direction. Then you must always keep the sail outside the boat. It should be at a 90°angle(角度)to the boat. Then it will catch the wind best.
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