阅读下面的短文，根据短文内容及所给的中文意思，写出正确的英文单词。（每空一词）
Tom is a schoolboy of Grade Eight. He lives a little far from the city. But his parents 1______ (送) him
to study in a 2______ (有名的) school in the center of the city last summer. They rented a house near the
school. On 3______ (工作日), he 4______ (走路) to school. It 5______ (花费) him about 10 minutes. In
the daytime, he has to have classes one and 6______ (另一个). He has to stay at school for 11hours every
day. After school, he 7______ (锻炼) on the playground for an hour, and gets home for dinner. He has a
good habit and 8______ (保持) healthy. On weekends, he goes to the 9______ (培训) center. And that
usually makes him feel 10______ (紧张的) out.
sin100πt （V）的 正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（ ）
/22 A
He的质量为m3，质子的质量为m4，则下列说法中正确的是( )