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问题 不定项选择

一个物体做自由落体运动，取g=10m/s2，则在物体下落的过程中[ ]

A、物体第2s末的速度为20m/s

B、物体第2s内的平均速度为10m/s

C、物体前2s内下落的高度为20m

D、物体第2s内下落的高度是10m

答案

AC

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(1)  As Polly o____________(86) the passengers on the train, she s______________(87) that she was being watched by a tall man in a dark coat. At last the train arrived at Green Park station. While the rest of the passengers were getting out, she g______________(88) at the faces around her. The tall man was nowhere to be seen.

(2)  An advertisement p____________ (89) information and uses p_____________(90) language and exciting images to encourage people to buy a product or service or believe in an idea. Billboards, newspapers, magazines, the Internet, radio and television are the most c_____________(91) places to find advertisements.

(3)  This proposal will give you some information about RealCline: how it works, why it is better than o_________________(92) cinema, and how it can be used in other ways. I believe you will be a______________(93) by the RealCine experience, and will agree that this is an e____________________(94) technology that must be d______________(95) further.
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单项选择题

（）不属于天然气输送系统中的液体和固体杂质的主要来源。

A、采气时井下带来的凝析油、凝析水、岩屑粉尘

B、管道施工时留下的焊渣

C、天然气中的氮气和硫化物

D、管道未干燥
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