人患急性炎症时，进行血常规检查时往往会发现血液中增多的是（  ）

关于电场，下列说法中正确的是（   ）

听短文，在短文中填写所缺单词
    Tom is a____boy. He is eleven years old. He's two years younger than his____, Jim. Tom is 150cm and Jim is 160cm. Jim is 50 kilos and Tom is 60 kilos. Tom wants to lose some weight, so he tries not to eat too much____. He also____more exercise than____.
    ____morning he gets up earlier than Jim and he goes____for____minutes. He usually does it after school. After dinner, Tom often goes for a ____, and Jim likes____at home. Now Tom is much____than Jim. Jim thinks he____more exercise now. He and Tom will do exercise tighter.

目前我国以煤炭发电为主。形成这些煤的植物类群主要是古代的（   ）

观察图中尺规作图痕迹，下列结论错误的是（　　）