Ⅰ. Read and remember the key words and expressions in Unit 1.
voyage, repetition, continent, discovery, official, relation, develop, foreign, development, pioneer, wealth, spread, ...

该题目为词汇记忆题，无需解题步骤，直接呈现词汇记忆结果如下：
1. voyage - 航行
2. repetition - 重复
3. continent - 大陆，洲
4. discovery - 发现
5. official - 官员；官方的
6. relation - 关系；亲属
7. develop - 发展，壮大
8. foreign - 外国的
9. development - 发展
10. pioneer - 先锋，先驱
11. wealth - 财富
12. spread - 传播

Ⅱ. Write down the English words according to the explanations.
1. t (buy and sell)
2. d (the act or process of finding something that others didn’t know about before)

3. o (a person who holds a public office)
4. f (from a country that is not your own)
5. w (the possession of much money or other valuable things)
6. r (the way in which two or more things are connected)
7. b (in addition to)
8. n (in no place)
9. d (make something become better and stronger)
10. r (to become more successful, important or powerful)

1. trade 2. discovery 3. official 4. foreign 5. wealth 6. relationship 7. besides 8. nowhere 9. develop 10. rise

1. 根据解释“buy and sell”（买卖）及首字母t，可知是trade（贸易）。
2. 解释“the act or process of finding something that others didn’t know about before”（发现他人之前不知道的事物的行为或过程），首字母d，为discovery（发现）。
3. “a person who holds a public office”（担任公职的人），首字母o，即official（官员）。
4. “from a country that is not your own”（来自非本国的），首字母f，是foreign（外国的）。
5. “the possession of much money or other valuable things”（拥有大量金钱或其他贵重物品），首字母w，为wealth（财富）。
6. “the way in which two or more things are connected”（两个或多个事物之间的联系方式），首字母r，是relationship（关系）。
7. “in addition to”（除……之外），首字母b，即besides（除……之外）。
8. “in no place”（无处），首字母n，为nowhere（无处）。
9. “make something become better and stronger”（使某物变得更好更强），首字母d，是develop（发展；培养）。
10. “to become more successful, important or powerful”（变得更成功、重要或强大），首字母r，为rise（上升；增强）。

Ⅲ. Complete the sentences according to the first letter or the Chinese meanings.
1. The parents are worried about their children studying in the foreign countries as the disease has s all around the world already.
2. It is well-known that there are seven c on the Earth.
3. Li Wei took some English classes (提高) his writing skills during summer holidays.
4. The (长颈鹿) are taken good care of by the keeper and they are like his kids.
5. Yuan Longping is a (先驱) in agricultural science, whose groundbreaking work on Hybrid rice has significantly improved global food security.

1. spread
2. continents
3. to improve
4. giraffes
5. pioneer

1. 根据句意“家长担心在国外学习的孩子，因为疾病已经在全世界蔓延”，结合首字母s，可知此处用spread“蔓延”，由has可知用现在完成时，故填spread的过去分词spread。
2. 根据句意“众所周知，地球上有七大洲”，结合首字母c，可知此处用continent“大洲”，seven后接名词复数，故填continents。
3. 根据中文提示“提高”，可知此处用improve，结合题干可知用不定式表目的，故填to improve。
4. 根据中文提示“长颈鹿”，可知此处用giraffe，由are可知用名词复数，故填giraffes。
5. 根据中文提示“先驱”，可知此处用pioneer，由a可知用名词单数，故填pioneer。