近年来，我国对超导材料的研究已跻身世界前列，目前为止年已找到临界温度为-141°C的超导材料，当温度降到-141°C左右时，这种材料的电阻变为____.
We have made a survey among 1,000 students from a middle school about their favorite food. students like fruits according to the form.
Kind of food
Chocolate
Banana
Cookie
Apple
Percentage(百分比)
Of the students
20％
30％
15％
?
