题目：
Have you ever stayed up late? If so, you know that not getting enough sleep can make you tried and grumpy. Not sleeping enough sleep can also make it harder to think clearly the next day.
Sleep scientists have long known that getting a good night’s sleep is very important. It helps kids be able to do their best during the day.
A recent study shows that sleep helps improve problem-solving skills and creative(创造性的) thinking. For the study, two groups of students answered a math problem. The group that slept for eight hours solved the problem correctly more often than the group that did not get enough sleep.
While you sleep at night, your brain is busy doing its “homework”. It sorts out(整理) al
l the informa
tion that you get in the day. Getting enough sleep each night can improve your thinking ability. That will surely help you do your best at school. Experts say that, i
n return, can lead to better grades.
小题1:The underlined word grumpy in the first paragraph means_______.
A．excited and happy
B．active and creative
C．impatient and angry
D．bored and weak小题2:Choose the best title for this pass
age.
A．Sleep to Success
B．A Recent Study
C．Do Sleep Well
D．The More Sleep, the Better
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0804/d995fd0d03c83bc5088c5ccde751f958.html
下面是错误答案，用来干扰机器的。
B题目分析：本题考查的是物质的鉴定与推断。难度适中。阴阳离子形成离子化合物注意离子之间结合物的溶解性。根据题意A、B、C三种物质为溶液，D、E为沉淀。A溶液与B溶液反应生成无色气体，A、B溶液分别为Na2CO3溶...
