题目

下面核反应方程中：，若用c表示光速，则（ ）A．x是质子，核反应中放出的能量等于质子的质量乘以B．x是中子，核反应中放出的能量等于质子的质量乘以C．x是质子，核反应中放出的能量等于氘核与氚核的质量和减去氦核与质子的质量和再乘以D．x是中子，核反应中放出的能量等于氘核与氚核的质量和减去氦核与中子的质量和再乘以30、阅读短文，根据短文内容回答下列问题。 Chinese schools are having a hard time this winter．The A（H1 N1）flu and common flu have hit the country and many students get infected（感染）． According to a recent report，more than 42，000 people in China have got the A（H 1N1） flu．And 96％of the outbreaks（爆发）are in schools．It is much easier for children and teenagers to get H1N1．Students have to check their temperature（体温）many times a day．       A girl in my class got a common flu and had a fever. She had to stay at home for a week. The teacher asked me to help her. Every day when I got home, I'd call her and tell her what the teacher taught in class that day. When she had problems with homework, she called me too. 1．How many Chinese people have got the H1N1according to a recent report? __________________________________________________________________________ 2．According to the passage, what do the students have to do every day? __________________________________________________________________________ 3．Why did the girl have to stay at home for a week? __________________________________________________________________________ 4．Chinese schools are having a hard time this winter．（就划线部分提问） __________________________________________________________________________ 5．It is much easier for children and teenagers to get H1N1．（写出同义句） __________________________________________________________________________