题目内容：

Chinese students always complain that they’re under great pressure and don’t get enough sleep. But they may be surprised to learn that they’re much luckier than their peers (同龄人) in South Korea and Japan, according to a recently published report, conducted by Shanghai Academy of Social Sciences on the physical and mental health of senior high school students in the three Asian countries.

Among nearly 6,000 high school students in the three countries, Chinese students are the tallest but poorest in physical fitness. Chinese students are on average 168.17cm, compared with 167.61cm for South Korean students and 164.70cm for Japanese students. Chinese students asked for sick leave more than students in other countries. About 72 percent of Korean students never asked for sick and injury leave during high school, compared to 53 percent for Japanese students and 45 percent for Chinese students.

As the survey presents, Japanese and South Korean students suffer more pressure. Statistics show 16 percent of students in China said they experienced mental pressure often over the past year, while the numbers in Japan and South Korea were 33 percent and 47 percent respectively. Their worries come from “study”, “friendships” and “relationship with their parents”. To go with stress, 57.9 percent of Korean students sleep the least, less than six hours a day, compared with 46.6 percent of Japanese students and 30 percent of Chinese students.

More Chinese students were satisfied with their physical appearance. In measures of self­worth, such as “I think I am valuable” and “I can complete many things”, “I won’t give up to failure”, Chinese students showed greater self­confidence than students in Japan and South Korea and they are the happiest among the three.

1.According to the survey, who sleep the most? (No more than 2 words)

_____________________________________________________________________

2.Among the surveyed 6, 000 students, how many Japanese students ever asked for leave? (No more than 3 words)

_____________________________________________________________________

3.Why are Chinese students happier than Korean and Japanese students? (No more than 5 words)

_____________________________________________________________________

4.What’s the passage mainly about? (No more than 18 words)

_____________________________________________________________________