The diagram shows four empty boxes made of different materials, K, L, M and N. The temperature of air inside each box at the start of the experiment is 30 °C.
The boxes are placed under the sun at the same location. After an hour, the temperature of air inside each box is measured and recorded in the table below.
Material used
Temperature of air inside each box (°C)
K
35
L
40
M
32
N
42
Which material would be most suitable for making a box to keep drinks cold for the longest time?
AK
BL
CM
DN
看答案和讲解
正确答案：C. M
考点热：热的不良导体与保温 · Heat: poor conductors keep things cold
思路：一小时后 M 盒里的空气温度最低（32 °C），说明 M 从外面传进去的热最少，是最差的热导体。用 M 做盒子最能让饮料保持冰凉。 Think: After an hour, the air in box M was the coolest (32 °C), so M let the least heat in. M is the poorest conductor of heat and best keeps drinks cold. 小提醒：保冷要用热的不良导体。 Tip: To keep things cold, use a poor conductor of heat.
第 2 题电南华小学 2025 EOY 第 29 题
David wanted to investigate whether four rods, E, F, G and H, were electrical conductors or insulators. He used the circuit shown below.
The table below shows what happened when the switch was closed and certain rod(s) was/were removed.
Rod(s) removed from circuit
Did the bulb light up?
E
Yes
F and G
Yes
E, F and G
No
E, G and H
No
Which of the following conclusions about the rods, E, F, G and H is correct?
考点电：用电路测试导体和绝缘体 · Electricity: testing conductors and insulators
思路：四根棒并联。拿走 E、F、G 灯不亮 → H 是绝缘体；拿走 E、G、H 灯不亮 → F 是绝缘体；拿走 F、G 灯还亮 → E 或 H 是导体，H 是绝缘体，所以 E 是导体；拿走 E 灯还亮 → G 是导体。 Think: The rods are in parallel. Removing E, F and G makes the bulb go off, so H is an insulator. Removing E, G and H makes it go off, so F is an insulator. Removing F and G keeps it lit, so E is a conductor. Removing E keeps it lit, so G is a conductor. 小提醒：只要有一根导体连着，灯就会亮。 Tip: The bulb lights up if at least one conductor is still connected.
第 3 题电南华小学 2025 EOY 第 30 题
Bulbs A, B, C and D were connected in a circuit hidden in a wooden box as shown. All the light bulbs lit up when the circuit was closed.
Jane removed one light bulb from the circuit each time and observed what happened to the rest of the light bulbs. Her observations are recorded in the table below.
Bulb removed
Bulb(s) lit
A
B, C and D
B
None
C
A and B
D
A and B
Which of the following correctly shows the circuit hidden in the wooden box?
A
B
C
D
看答案和讲解
正确答案：C.
考点电路：根据灯泡亮灭推断电路连接 · Circuits: working out the hidden circuit
思路：拿走 B 全部熄灭，B 在主线路上。拿走 A，B、C、D 还亮，说明 A 和其他灯在不同支路。拿走 C 或 D，A、B 还亮，C、D 一起熄灭，说明 C、D 串联在同一条支路，和 A 并联。所以是电路 (3)。 Think: Removing B makes all bulbs go off, so B is in the main path. Removing A leaves B, C and D lit, so A is on its own branch. Removing C or D leaves only A and B lit, so C and D are in series on one branch in parallel with A. This is circuit (3). 小提醒：同一条支路上的灯泡会一起亮、一起灭。 Tip: Bulbs on the same branch go on and off together.
第 4 题磁铁卍慈学校 2025 EOY 第 28 题
Guoling conducted an experiment using a bar magnet to magnetise a steel bar and made the following conclusion, “The poles of magnetized steel bar will change if I use the opposite pole of the magnet to stroke steel bar.”
Setup
Outcome
A
B
C
D
Which pairs of diagrams support her conclusion?
AA and B
BA and C
CB and C
DB and D
看答案和讲解
正确答案：C. B and C
考点磁铁：用磁铁的不同极摩擦钢条，钢条的磁极会改变 · Magnets: stroking with the opposite pole changes the poles
思路：要证明“用相反的极摩擦，钢条的磁极会改变”，就要比较两个只差在用哪一极摩擦的实验，而结果磁极相反。B 用 S 极，得到左 N 右 S；C 用 N 极，得到左 S 右 N。两者磁极正好相反，支持她的结论。 Think: Compare a set-up using the S pole with one using the N pole. B (S pole) gives N–S and C (N pole) gives S–N. The poles are swapped, so B and C support her conclusion. 小提醒：比较时，只能有一个条件不同。 Tip: Only one thing should be different between the two set-ups.
第 5 题动植物分类卍慈学校 2025 EOY 第 3 题
The following table gives information on four plants, J, K, L and M, based on two characteristics. A tick (✓) shows that the characteristic is present.
Characteristics
Plant
J
K
L
M
Have flowers
✓
X
✓
X
Grows on land
X
✓
✓
X
From the information in the table above, the plants are classified as shown below.
Which plant, J, K, L or M, can be classified as Y?
思路：Y 在“会结果”和“陆生植物”下面。会结果的植物一定开花，所以要找“有花”而且“长在陆地上”的植物。表中只有 L 两项都打勾。 Think: Y bears fruits and is a land plant. Plants that bear fruits have flowers. Only L has flowers and grows on land. 小提醒：会开花的植物才会结果。 Tip: Only flowering plants bear fruits.
第 6 题人体呼吸与循环系统乐赛学校 2025 EOY 第 10 题
Adam, Keith and Tom wanted to measure the volume of air they breathe out using the set-up shown below.
The bottle was filled the water fully in the beginning. Adam took a deep breath and blew as much air as possible through the rubber tubing. The height (h) of air in the bottle was measured. The experiment was repeated by Keith and Tom respectively.
The results of their experiment are shown in the table below.
Students
Height, h (cm)
Adam
15
Keith
26
Tom
21
Which of the following statements is correct?
ATom has the greatest lung capacity.
BAdam exhaled the least amount of air.
CAdam displaced more water in the bottle than Keith.
DKeith could hold the smallest amount of air in his lungs.
看答案和讲解
正确答案：B. Adam exhaled the least amount of air.
考点呼吸系统：用排水法比较呼出空气量 · Respiratory system: comparing volume of air breathed out
思路：瓶里空气的高度 h 越大，吹出的空气越多。Adam 的 h 最小（15 cm），所以他呼出的空气最少。Keith 的 h 最大，肺活量最大。 Think: A bigger height h means more air was breathed out. Adam has the smallest h (15 cm), so he exhaled the least air. Keith has the biggest h. 小提醒：吹进去的空气把水挤出去。 Tip: The air blown in pushes water out of the bottle.
第 7 题植物与动物的繁殖道南学校 2025 EOY 第 6 题
The table below shows the characteristics of fruits, X, Y and Z.
Fruits
Characteristics
X
Has a wing-like structure
Y
Has a fibrous husk
Z
Is fleshy and juicy
The diagram below shows the dispersal patterns of the fruits, X, Y and Z.
Which of the following correctly matches the dispersal patterns of fruits X, Y and Z?
Acircle: X, triangle: Y, square: Z
Bcircle: Y, triangle: Z, square: X
Ccircle: Z, triangle: X, square: Y
Dcircle: Y, triangle: X, square: Z
看答案和讲解
正确答案：D. circle: Y, triangle: X, square: Z
考点果实与种子的传播方式：风、水、动物 · Seed dispersal by wind, water and animals
思路：圆形的幼苗都在河边 → 靠水传播 → 有纤维外壳的 Y；三角形的幼苗顺着风向分布 → 有翅的 X；正方形的幼苗散得很远、四处都有 → 多汁果肉、被动物吃了带走的 Z。 Think: Circles grow along the river → water → fibrous husk Y. Triangles spread in the wind direction → winged X. Squares are scattered far in all directions → animals → juicy Z. 小提醒：先看幼苗分布的规律，再对应果实特征。 Tip: Look at where the young plants grow first, then match the fruit feature.
第 8 题热爱同学校 2025 EOY 第 15 题
Jacob placed a glass jar with a metal lid in a refrigerator.
He took out the jar and tried opening it after some time. He failed to unscrew the metal lid from the glass jar.
Which statement explains Jacob’s difficulty to open the jar?
AThe metal lid lost heat faster to the glass jar and contracted more.
BThe metal lid lost heat faster to the refrigerator and contracted more.
CThe metal lid gained heat faster from the glass jar and contracted more.
DThe metal lid gained heat faster from the refrigerator and contracted more.
看答案和讲解
正确答案：B. The metal lid lost heat faster to the refrigerator and contracted more.
考点热：金属受冷收缩 · Heat: metals contract when they lose heat
思路：在冰箱里，金属盖比玻璃更快把热量散失到冰箱冷空气中，收缩得更多，紧紧箍住瓶口，所以打不开，选 (2)。 Think: The metal lid loses heat faster to the cold refrigerator and contracts more, so it grips the jar tightly. 小提醒：失去热量会收缩，得到热量会膨胀。 Tip: Losing heat makes things contract; gaining heat makes them expand.
第 9 题生命周期爱同学校 2025 EOY 第 4 题
The bar graph below shows the number of days that insects X and Y spend in each stage of their life cycles.
Based on the graph, which statement is correct?
AInsect Y lays more eggs than insect X.
BThe egg of insect X takes six days to hatch into a larva.
C10 days after insect X’s egg hatches, it will be in larva stage.
DOn the thirteenth day after the egg is laid, insect Y is at its pupa stage.
看答案和讲解
正确答案：B. The egg of insect X takes six days to hatch into a larva.
考点生命周期：读条形图找各阶段天数 · Life cycles: reading days in each stage from a bar graph
思路：从图上读，X 的卵期是 6 天，所以 X 的卵要 6 天才孵化成幼虫，(2) 对。图只告诉我们天数，不知道产卵多少 (1)；X 孵化后幼虫期 8 天，10 天后已是蛹 (3) 错；Y 的卵期 10 天、幼虫期 12 天，第 13 天还是幼虫 (4) 错。 Think: Insect X stays 6 days as an egg, so its egg takes six days to hatch. The other statements do not match the graph. 小提醒：把每个阶段的天数一段一段加起来。 Tip: Add up the days stage by stage.
第 10 题人体系统爱同学校 2025 EOY 第 9 题
The graph shows the amount of undigested food in organs A, B and C in the human digestive system.
Based on the information above, which of the following statements is correct?
ANo digestion occurred in organ C.
BMost food was digested in organ A.
CAll the organs, A, B and C, release digestive juices.
DMore digested food was absorbed in organ A than in organ B.
看答案和讲解
正确答案：C. All the organs, A, B and C, release digestive juices.
考点消化系统：各器官分泌消化液 · Digestive system: organs that release digestive juices
思路：A、B、C 三个器官里，未消化食物离开时都比进入时少，说明三处都有消化，都有消化液（如口腔的唾液、胃液、小肠的消化液），选 (3)。C 中减少得最多，所以 (1)(2) 错；图上看不出吸收多少 (4)。 Think: Undigested food decreases in all three organs, so all three release digestive juices. 小提醒：进入多、离开少，说明食物在这里被消化了。 Tip: Less food leaving means digestion took place.
