84. A 7-segment Light-Emitting Diode is most likely used to               .
(A)indicate the status of power source
(B)connect anode and cathode
(C)light the circuit board
(D)show a number

85. The “law of conservation of energy” means                 . (A)energy is conserved when electric energy shows up (B)STEM guarantees the conservation of energy (C)energy is neither created nor destroyed (D)energy is important in the world

86. AI is used to solve today’s complex problems, for example, finding the source of COVID-19 outbreak and providing means to slow and stop the spread of virus. What does the abbreviation of AI stand for？ (A)Academic incentive (B)Artificial incentive (C)Artificial intelligence (D)Academic intelligence

87. Kolb’s experiential learning model is suggested to be used in STEM teaching for not only equipping students with traditional skills in using technology tools but also promoting their level of cognition. As the first step begins with hands-on work providing concrete experience, then the third step is abstraction. The purpose of abstraction is to build up                   . (A)hands-on skills (B)concept (C)STEM tools, for example, arduino (D)computing thinking

88. A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another. A varying current in any one coil of the transformer produces a varying magnetic flux in the transformer's core, which induces a varying electromotive force across any other coils wound around the same core. Transformers are commonly used in our daily life, and provide the voltage we need, for example, from220 volt to 110 volt. Such emerging work is achieved by varying                 . (A)the size of transformer's magnetic core (B)the number of turns in a winding (C)the magnetic flux in the core (D)the material of the core

89. Cellphone is a common device in people’s daily life. When it runs out of power, people need to recharge it. The common scheme is to use a charger, which intakes 110 volt and provides roughly how many volt output to the cellphone？ (A)0.05 Volt (B)0.5 Volt (C)5.0 Volts (D)50 Volts

90. In general, how many individual LED are implemented in 7-segment display LED used in today’s school laboratory？ (A)6 (B)7 (C)8 (D)9

51. Which of the following themes is not included in Health Promoting School Projects？ (A) sexuality education (B) tobacco control (C) ideal body weight (D) school environmental protection

52. "Tooth brushing teaching" can be categorized in which of the following major aspects of health promoting school？ (A) personal health skills (B) school health policy (C) social environment of schools (D) health service

53. According to the World Health Organization (WHO) standard, an "aged society" is a country or region in which people over 65 years old exceeds how many percent of the whole population？ (A) 5% (B) 7% (C) 14% (D) 20%

54. Up to now, there are over 300,000 people died in COVID-19 (Coronavirus disease-2019) globally. Which of the following country has the most reported deaths in COVID-19？ (A) China (B) United State (C) Russia (D) Italy

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