题目内容
That piece of music sounds quite familiar. Who ______ the piano upstairs?( )
A. has played B. played C. plays D. is playing
D
Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.
You may ask your friends to try to do that when you are having dinner together. There is a saltcellar on the table. You must use salt when you carry out this experiment.
First you put the string across the piece of ice. Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. But when it melts, it will lose heat. The cold ice cube will make the salt water freeze again. After a minute or two you may raise the piece of string and with it you will raise your piece of ice!
This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. If you don’t put enough salt, the water will freeze again.
【小题1】 We must use _______ when we carry out this experiment.
A.fridge | B.some food | C.a table | D.some salt |
A.More than three minutes. | B.Five minutes or so. |
C.Only one minute or two. | D.About ten minutes. |
A.Put the ice cube into the glass of water with the help of the string. |
B.Take out the ice cube in the glass of water with the help of the string. |
C.Take out the ice cube in the glass of water with your fingers. |
D.Put some salt on the ice cube and then put the string across it. |
A.Three. | B.Four. | C.Six. | D.Seven. |
A.physics | B.biology | C.chemistry | D.maths |
Worried about how many calories you will get in that piece of pizza, chocolate cake or bag of chips? A new iphone application Mealsnap may help. Users just need to take a picture of the meal with the phone, and it will give a calorie read-out almost immediately.
Mealsnap was developed by DailyBurn, a health social network that focuses on helping its users lead healthier lifestyles. It has created several other health and diet-related iphone applications. The applications gives users a quick reply. To do that, it matches the taken picture to a databank containing the calorie information of nearly 500,000 kinds of food. Users then get the range of calories for the meal that is photographed.
We started with something simple — an apple. A couple of minutes later the application replied that it was an apple and between 64 and 96 calories. More impressive was the reply we received after sending a photo of mixed salad bowl. Mealsnap replied that the bowl contained “yellow rice with corn, boiled eggs and beans” and that the food was between 532 and 798 calories.
Mr. Smith, director of DailyBurn, said that usual calorie counting needed a long time, but that the application made it easier to know the calories in food. That’s why it is so popular among those who are trying hard to lose weight.
In addition, Mealsnap can serve as a food diary. No need to write down what they’ve eaten, the photos will be stored. Then users can keep a visual log (记录). Mr. Smith said: “It’s like a food journal, but easier. All you do is to take the picture. The simple act of recording something can cause a psychological change that can help people on their health journey. Knowing the calorie range makes me think more about what I’m eating.
60. 【小题1】The purpose of DailyBurn is to _______.
A.help people have a healthy life |
B.make iphone more popular |
C.help people find ways to lose weight |
D.persuade people to buy iphone products |
A.a camera | B.a phone | C.a calculator | D.an application |
A.Mealsnap can also tell what the food is. |
B.Mealsnap is only useful for simple things. |
C.The result of Mealsnap isn’t always right. |
D.Mealsnap needs a long time to show the calorie range. |
A.Mealsnap iphones work as a health signal |
B.Mealsnap iphones offer you a health signal |
C.Mealsnap iphones — the best-selling phones |
D.Mealsnap iphones count your calories |