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下面哪一個題目對三年級學生最為困難? (A)一條彩帶 4 公分,5 條彩帶合起來共長幾公分? (B)小雄有 4 件襯衫,5 條長褲, 小雄 可以搭配出幾套外出服? (C)媽 媽 買 了 4 打 鉛 筆 , 每 打 12 枝 , 請 問 媽 媽 一 共 買 了 多 少 枝 鉛 筆 ? (D)小方用白色積木排出一個 4 列,6 排的陣列,請問小方用了多少個白色積木?

28. Albert:_____________________Elissa:Oh, I see. I’ll add you later.(A) See you tomorrow. (B) Merry Christmas!(C) I just sent a friend request to you on Facebook. (D) I am full.

29. Anne:When will the football game start?Bill:In five minutes. ___________ We’re late.(A) Hurry up! (B) Time to go home.(C) Where? (D) It rains in summer.

30. Mark:Hi, Tony. What do you do to keep fit? Tony:____________________ Do you want to go with me? Mark:It sounds like a great idea!(A) It’s not your fault. (B) You are the painters.(C) I’m sure. (D) I swim seven times a week.

19. A radio-wave transmitter and a receiver are separated by a horizontal distance $d = 60.0 \, \text{m}$. Both antennas are located at a height $h = 40.0 \, \text{m}$ above the ground, as shown in the figure. The receiver detects two signals: one travels directly from the transmitter, and the other is reflected from the ground. Assume the ground is perfectly level and that a $180^{\circ}$ phase shift occurs upon reflection. What is the longest wavelength that results in destructive interference at the receiver?(A) $20.0\mathrm{m}$ (B) $26.7\mathrm{m}$ (C) $40\mathrm{m}$ (D) $80\mathrm{m}$ (E) $160\mathrm{m}$

20. A square coil consists of $N = 10$ closely wrapped turns and has side length $a = 0.50 \, \text{m}$. The coil is hinged along the y-axis, and its plane makes an angle $\theta = 60.0^{\circ}$ with the x-axis, as shown in the figure. The current in the coil is $I = 1.50 \, \text{A}$ in the direction indicated, and the coil is placed in a uniform magnetic field $B = 0.40 \, \text{T}$ directed along the positive x-axis. What is the torque exerted on the coil by the magnetic field, and what is its direction when viewed from above (looking down along the +y-axis)?(A) $0.75\mathrm{N}\cdot \mathrm{m}$ clockwise (B) $0.75\mathrm{N}\cdot \mathrm{m}$ counter-clockwise(C) $1.3\mathrm{N}\cdot \mathrm{m}$ clockwise (D) $1.3\mathrm{N}\cdot \mathrm{m}$ counter-clockwise (E) None of the above