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单选题 如图所示的电路,电源电压不变.当开关S由断开到闭合,电路中(  ).

A

电流表示数不变,电阻R2两端电压减小

B

电流表示数变大,电阻R2的功率变大

C

电流表示数变小,总功率变大

D

电流表示数变大,总电阻变小

单选题 如图所示,几只串联的水果电池提供的电力足够点亮排成V字形的一组发光二极管.下列说法正确的是(  ).

A

水果电池将电能转化为化学能

B

发光二极管是由半导体材料制成的

C

一组二极管同时发光说明它们一定是串联的

D

如果少串联一个水果电池,二极管将变亮

单选题 Why were books expensive and rare before the invention of printing?

A

People could not read.

B

People could not write words on paper.

C

People could not find silk, cotton or bamboo.

D

People could only produce books one at a time by hand.

单选题 At the places where you see Sign 1, ______.

A

you are already out of a town

B

you still have thirty kilometers to go

C

there must be many houses and buildings not far away

D

there must be a town thirty k8ilometers away

单选题 According to the passage, we know ______.

A

graffiti can make the buildings look cool

B

the person who collects rubbish cart get a gift

C

we can plant trees to improve the environment

单选题 下列混合气体比乙烯含碳质量分数高的是(  ).

A

甲烷+乙烯

B

乙烷+丁烯

C

乙炔+丙烯

D

乙烷+丙烯

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