问题 选择题

配制100 mL 0.1 mol·L1Na2CO3溶液,下列操作正确的是(    )

A.称取1.06 g无水碳酸钠,加入到100 mL的容量瓶中,加水溶解、定容

B.称取1.06 g无水碳酸钠,加入100 mL蒸馏水,搅拌、溶解

C.转移Na2CO3溶液时,未用玻璃棒引流,直接倒入容量瓶中

D.定容后,塞好瓶塞,反复倒转,摇匀

答案

答案:D

A、不正确,容量瓶不用于溶解物质;B、不正确,先加少量水不溶解;C、不正确,要用玻璃棒引流;D、正确;选D。

阅读理解

阅读理解。

     Saturday,                                                                                   June 16th  

     In the morning, we went camping along a path in Green Natural Park. We were happy because it

was a sunny day. We were expecting an enjoyable two-day holiday. On the way, we kept singing and

making jokes.

     However, in the afternoon, when we finished our picnic at one o'clock, it was dark and windy.

Soon, there was a shower. Unluckily, none of us brought an umbrella. We ran about but we could find

no place to hide.

     Twenty minutes passed and it was still raining, There were hours to go before we reached the

campsite (野营地). It was even worse that our small compass (指南针) showed that we went to the

wrong way. We had lost our way!  

      We had to make a quick decision as it was raining heavily. Chris said we could set up a tent to hide

in, so Mary and Tom helped to set up the tent. Chris and I tried to make a fire to keep us warm. But we

were unable to light the fire, as everything was wet. We dried ourselves, chatted and waited inside the

tent. At about five o'clock, it stopped raining. We decided to give up the camping trip because all of us

had been very tired.

     This camping trip may not be very successful but we know each other better. And the most

important thing I've learned from this trip is the importance of team spirit.

1. The writer went camping in Green Natural Park __________.

A. for 4 hour      

B. for 2 days      

C. in June      

D. in the afternoon

2. It was even worse that they __________.

A. had no picnic                      

B. lost their way

C. couldn't light the fire                

D. couldn't know each other

3. Chris suggested that they should __________ in the rain.

A. set up a tent                      

B. reach the campsite

C. keep singing                      

D. find a place to hide

4. Which of the following is NOT true?

A. It was sunny in the morning.          

B. None of them had an umbrella.

C. They gave up the camping at last.      

D. They ran about to dry themselves.

5. The writer has learned the importance of __________  from the trip.

A. making a decision                  

B. working together

C. enjoying holidays                  

D. taking a compass

单项选择题