问题 选择题

下列说法,正确的是(  )

A.如果两个数的和为零,那么这两个数一定是一正一负

B.若-2+x是一个正数,则x一定是正数

C.-a表示一个负数

D.两个有理数的和一定大于其中每一个加数

答案

A、如这两个数都是0时,就不满足,故错误;

B、若-2+x是一个正数,则x一定大于2,一定是正数,故正确;

C、当a=0时,-a=0,既不是正数也不是负数,故错误;

D、两个负数的和就一定小于每一个加数,故错误.

故选B.

单项选择题

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。学科&网

Hundreds of people have formed impressions of you through that little device(装置) on your desk. And they’ve never actually   41   you. Everything they know about you   42   through this device, sometimes from hundreds of miles away.   43   they feel they can know you   44   from the sound of your voice. That’s how powerful the   45   is.

Powerful, yes, but not always   46  . For years I dealt with my travel agent only by phone. Rani, my faceless agent whom I’d never met   47  , got me rock-bottom prices on airfares, cars, and hotels. But her cold voice really   48   me. I sometimes wished to   49   another agent.

One morning, I had to   50   an immediate flight home for a family emergency. I ran into Rani’s office   51  . The woman sitting at the desk,   52   my madness, sympathetically jumped up. She gave me a   53   smile, nodded while listening patiently, and then printed out the   54   immediately. “What a wonderful lady!” I thought.

Rushing out   55   I called out over my shoulder, “By the way, what’s your name?” “I’m Rani,” she said. I turned around and saw a   56   woman with a big smile on her face waving to wish me a safe trip. I was   57  ! Why had I thought she was cold? Rani was, well, so   58  .

Sitting back in the car on the way to the airport, I figured it all out. Rani’s   59  ---her warm smile, her nods, her ‘I’m here for you’   60  ---were all silent signals that didn’t travel through wires.

59()

A.forgiveness

B.eagerness

C.friendliness

D.skillfulness

单项选择题 A1型题