题目内容

【题目】下列溶液中,溶质是液体的是(

A.医用葡萄糖溶液 B.20%的氢氧化钠溶液

C.75%的消毒酒精 D.0.9%的生理盐水

【答案】C

【解析】

试题分析:溶质可以是固体、液体、气体,溶剂只能是液体,当两种液体相互溶解时,以量多的为溶剂,量少的为溶质;如果两种液体中有水,则不论水量的多少,水都是溶剂。A.医用葡萄糖溶液是固体葡萄糖溶于水形成的,溶质是固体葡萄糖,错误;B.氢氧化钠在常温下是固体,氢氧化钠溶液中,溶质是固体氢氧化钠,故B错误;C.75%的消毒酒精是酒精溶于水水形成的,其中酒精占了75%,水占了25%,酒精是溶剂,酒精在常温下是液体,故正确;D.0.9% 的生理盐水是食盐的水溶液,食盐是溶质,食盐在常温下是固体,D错误。故选C

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【题目】B

What do we do when we go camping? First, we think of a plan. We take food, clothes, a knife, and things for cooking and eating. We take things to keep us away from insects(昆虫) and the sun. Then we put everything into the car and we drive to the woods. We look for a place for campers(露营者) and we look for a good place for our tent(帐篷). The place should have a lot of air. This will keep some insects away. High land with water on both sides of it is good. Then we put up our tent. We put everything into the tent, and we are ready for fun. We can swim in the lake, walk in the woods, climb a mountain, row a boat, or go fishing. In the evening we come back to the tent, we build a big fire because it can keep the insects away. We sit around the fire and talk. We may tell interesting stories or we may sing songs. At night we lie down on the grass. We can look up at the stars. It is a busy day, so we try to go to sleep early. Everything is dark. Everything is quiet. We hope we won’t hear music from the radio in the next tent. We hope it won’t rain.

【1】Before going to camp we should first __________.

A. think of a plan B. take some food

C. take things to keep us warm D. take something for cooking and eating

【2】 We go to camp __________.

A. by bus B. bycar C. by bike D. on foot

【3】Campers can join in __________ activities.

A. one or two B. only a few

C. many D. two or three

【4】In the evening we build a fire because __________.

A. it is cold at night B. it can keep us warm

C. it can keep the insects away D. it is dark and quiet

【5】The campers like to __________ at night.

A. hear music from the radio B. go to sleep early

C. have rain D. be busy

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