Look! A large number of boys _____ the g_爱下问搜题

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问题选择题

Look! A large number of boys _____ the ground, the number of them _____ 20. [ ]

A. is running, are

B. are running, is

C. are runing, is

答案

答案：B

单项选择题 A1型题

儿童理想的血铅水平为（）

A.1.2μmol／L

B.1.1μmol/L

C.0.6μmol／L

D.0.48μmol／L

E.0μmol／L

单项选择题

杭州在梅雨过后，会出现“伏旱”天气。形成“伏旱”天气的天气系统是（）

A.气旋

B.台风

C.锋面

D.反气旋