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等几位同学结伴到海边游玩,他们发现,中午海边的沙子热,海水却很凉;傍晚海的沙子凉,海水却比较暖和.对此,同学们提出如下猜想:可能是因为沙子吸热升温或放热降温都比.他们分成两个探究小组来设计实验来验证此猜想. (1) 他们在实验前准备了火柴、酒精灯、烧杯、沙子、水、搅拌棒、天平、铁架台和石棉网,除此之外,还需要 ________ 、 ________. 实验时使用搅拌棒的作用是 ________ . (2) 请你为他们的实验设计一个表格用以填实验数据. (3) 两小组获得的实验结论分别是: 1 等质量的沙子和水升高相同的温度时,加热沙子的时间短; 2 等质量的沙子和水加热相同的时间,沙子的温度上升的多; 你认为上述结论能验证猜想的是 ________ . ( 选填 “1” 、 “2” 或 “1 和 2”) (4) 探究过程中也有部分同学提出:可能是中午海水蒸发吸收热量,所以温度低;而沙子不蒸发,所以温度高.你认为上述猜想是否正确?请说明理由. ________.
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He often is positioned as the “ father ” of American literature.
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【多选题】【 Cultural knowledge 】 Answer the following questions according to your personal knowledge. (There are more than 1 correct answer.) Try to find out which statements are TRUE about humanities .
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Humanities are academic disciplines that study aspects of human society and culture.
B.
Humanities use methods that are primarily critical, or speculative.
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B.
He often is positioned as the “ father ” of American literature.
C.
He led the transcendentalist movement( 超验主义运动 ) of the mid-19th century.
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He was seen as a champion of individualism.
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Humanities are academic disciplines that study aspects of human society and culture.
B.
Humanities use methods that are primarily critical, or speculative.
C.
Humanities have a significant historical element.
D.
Humanities include ancient and modern language, literature, philosophy, geology, history, religion, art and musicology.
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A.
He is an American essayist, lecturer and poet.
B.
He often is positioned as the “ father ” of American literature.
C.
He led the transcendentalist movement( 超验主义运动 ) of the mid-19th century.
D.
He was seen as a champion of individualism.
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【单选题】The circuit is shown in the figure, we can find out that when the resistor R becomes larger, which of the following statements is right.Choose A,B,C or D.
A.
I1 is not changed. I1不变
B.
I2 is not changed. I2不变
C.
I3 is not changed. I3不变
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【多选题】Try to find out which statements are TRUE about roommates and majors in American colleges .
A.
Freshman roommates are usually assigned randomly .
B.
American colle students may not take the same classes, and do not have to choose their majors the first year.
C.
In the junior or senor year it ’ s quite common for students to move to off-campus apartments.
D.
There is much likelihood that freshman roommates will become lifelong friends.
查看完整题目与答案
【单选题】打开浓盐酸、浓硝酸、浓氨水等试剂的瓶塞时,应在( )中进行:
A.
冷水浴
B.
走廊
C.
通风橱
D.
药品柜
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【多选题】Try to find out which statements are TRUE about American friendship .
A.
The word “friend” can be applied to a wide range of relationships.
B.
A friendship maybe superficial, casual, situational or deep and enduring.
C.
Few Americans stay up for a lifetime , they move a lot.
D.
Americans are ready to make new friends to start new life.
查看完整题目与答案
【多选题】Find out one or more correct statements from the following choices.
A.
Scholarly journal articles reveal the original research, including the methodologies and discussion of the results.
B.
Scholarly journal articles are more precise and authoritative than magazine and newspaper articles.
C.
Scholarly journal articles must be peer-reviewed.
查看完整题目与答案
【单选题】Which of the following statements can NOT explain the fact that it is not easy to find out what people need?
A.
No two people have the same nutritional needs.
B.
It takes many years to reach a scientific conclusion as to the effect of a certain diet.
C.
Nutritionists do know the range of intake of, say, calcium that different people need
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None of the above.
查看完整题目与答案