Lin Tao can't be at home. I saw him _____爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

Lin Tao can't be at home. I saw him _______here a few minutes ago.

A．plays

B．to play

C．playing

D．played

答案

答案：C

单项选择题 A1/A2型题

下列各项，不属外感咳嗽的病因是（）

A.风

B.寒

C.暑

D.燥

E.热

单项选择题

设随机变量X～N(0，1)．Y～N(1，4)且相关系数ρ_XY=1，则______．

A．PY=-2X-1=1

B．PY=2X-1=1

C．PY=-2X+1=1

D．PY=2X+1=1