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WorksheetsScience
Total questions: 20
Worksheet time: 10mins
冰激凌中含量第二多的物质一般是什么
空气
糖
油脂
冰晶
当警车从远处驶来时，嗡嗡的鸣笛声都会随着汽车的靠
近变得尖锐，而当驶向远方的时候，声音又变得低沉了这是由于（ ）效应
法拉第效应
开普勒效应
多普勒效应
丁达尔效应
地球上最轻的金属单质是（ ）
钠
铝
钯
锂
小蓝想做一道紫甘蓝沙拉，他调了一点油醋汁放了进去，请问紫甘蓝汁最有可能变成什么颜色
紫色
粉色
红色
绿色
毒毒做了曲奇饼干，结果发现硬梆梆的，不酥脆，可能是因为她少放了哪一味调料
香草精
鸡蛋
盐
小苏打
正常人体内，酸性最强的液体在哪里
口腔
血液
胃
肾脏
在地球上不可能观测到天象是
月环食
月偏食
日环食
日偏食
Roughly how long does it take for the sun’s light to reach Earth
8 seconds
8 minutes
8 hours
8 days
Humans and chimpanzees share roughly how much DNA?
99%
98%
97%
96%
What is the biggest planet in our solar system?
Neptune
Mars
Jupiter
Saturn
Many diseases have an incubation period. Which of the following best describes what an incubation period is?
The period during which someone builds up immunity to a disease
The recovery period after being sick
The period during which someone has an infection but is not showing symptoms
The effect of a disease on babies
毒毒在家被毒蚊子咬了，又红又痒，请问那个方法可以止（毒液主要成份是蚁酸
来点烧碱
涂点肥皂水
抹点醋
涂点唾液
Which of the following is an example of genetic engineering?
Finding the sequences of bases in plant DNA
Attaching the root of the type of plant of the stem of another type of plant
Growing a whole plant from a single cell
Inserting a gene into plants that makes them resistant to insects
在电磁波谱中，频率最高的是
无线电波
可见光
X射线
伽马射线
中国第一个月球软着陆的无人登月探测器
嫦娥一号探测器
嫦娥二号探测器
嫦娥三号探测器
嫦娥四号探测器
Which scientist proposed three laws of planetary motion based upon observations of the orbit of Mars?
Galileo Galilei
Johann Kepler
James Maxwell
Isaac Newton
A scientist is conducting a study to determine how well a new medication treats ear infections. The scientist tells the participants to put 10 drops in their infected ear each day. After two weeks, all participants' ear infections had healed.
Which of the following changes to the design of this study would most improve the ability to test if the new medication effectively treats ear infections?
Ceate a second group of participants with ear infections who use 15 drops a day
Have participants use ear drops for only one week
Create a second group of participants with ear infections who do not use any ear drops
Have participants put ear drops in both their infected ear and healthy ear
The time a computer takes to star to start has increased dramatically. One possible explanation for this is that the computer is running out of memory.
This explanation is a scientific...
Conclusion
Hypothesis
Experiment
Observation
体重60kg的小绿想要提起一个80kg的重物，他选择用定滑轮和绳子组成装置。
如果小绿竖直向下用力，并取g=10N/kg，当他施加多大的力时可以提起重物？
并不能提起来
1400N
800N
200N
When large areas of forest are removed so land can be converted for other uses, such as farming, which of the following occurs?
Decreased carbon dioxide
Colder temperature
Greater oxygen production
Increased erosion
