18 What is the focus of the final paragraph?
(A) The legal status of immigrants in the US.
(B) The establishment of Pew Research Center.
(C) The importance of National Census.
(D) The influence of immigrants from Mexico.

14 (A) locations (B) operations (C) establishments (D) expectations

15 (A) dislocate (B) determine (C) unsettle (D) cultivate

16 What is the best title for this passage? (A) Diverse Backgrounds of Immigrants. (B) Key Findings about US Immigrants. (C) Reasons for Becoming Immigrants. (D) Rights and Obligations of Immigrants.

17 According to the passage, which of the following statements is NOT true? (A) The number of immigrants in the US occupies one-fifth of the total of immigrants in the world. (B) The year of 2018 marked the record high for the foreign-born population in the US. (C) More than one-third of immigrants in the US are unauthorized. (D) The US used to have a national quota system.

19 According to the passage, what is the main contributor to the decline in the unauthorized immigrant population in 2017? (A) The implementation of new immigration laws in the US. (B) The undercount adjustment to the census data. (C) The increase of naturalized citizens and permanent residents. (D) The decrease of immigrants from Mexico.

20 According to the passage, which of the following statistics is NOT correct? (A) Ever since the US immigration laws replaced a national quota system in 1965, the number of immigrants living in the US has grown more than six times. (B) In 1970, immigrants accounted for 4.8% of the US population. (C) In 2017, about 23% of all immigrants were unauthorized immigrants. (D) In 2017, unauthorized immigrants in the US accounted for 3.2% of the US population.

1 智慧救災系統平板電腦的電池容量為 8000 mAh。如果平板電腦完全沒電後，使用功率為 30 W 的快速充電器，若以 15 V 的定電壓來提供充電，則充滿平板電腦電池所需時間為何？ (A) 2 小時 (B) 4 小時 (C) 6 小時 (D) 8 小時

2 有關電學使用的單位，下列敘述何者正確？ (A)智慧手機電池存儲的電荷以安培(ampere)為單位 (B)兩平行導線間的電位能以伏特(volt)為單位 (C)單位正電荷在平行板間移動的能量以庫倫(coulomb)為單位 (D)微波爐在工作時使用的功率以瓦特(watt)為單位

3 下列那一個電力線(電場線)的圖示，可以表示正電荷 q 由 P 向 Q 作加速運動，且其加速度愈來愈大？ (A) (B)(C)(D)

4 由實驗分析知道，均勻金屬線的電阻與長度有關。有關某一均勻金屬線的電阻，下列敘述何者正確？ (A)電阻與長度成正比 (B)電阻與長度成反比 (C)電阻與長度 2 次方成正比 (D)電阻與長度 2 次方成反比