【文章內(nèi)容簡介】 B. though C. but D. so【解析】選D。作者認為自己所做的對每個人都有好處, 所以(so)不久會再做一次。Ⅲ. 語法填空　　Rome wasn’t built in a day. Nearly two decades have passed since China launched the first Beidou satellite in 2000. Since then, more Beidou satellites have been sent into orbit, 1. __________(form) the Beidou Navigation Satellite System (BDS). In late 2012, BDS 2. __________(begin) providing services to people in China and other parts of the AsiaPacific region. At the end of 2018, it started to provide global services. Now with two more Beidou satellites 3. (launch) on Dec. 16, 2019, BDS has 53 satellites in orbit. It 4. __________(expect) to greatly improve the system’s ability to serve 5. __________(user) worldwide. Although a satellitebased navigation system needs only 24 satellites to run 6. __________(proper), having 53 allows for better coverage. This is 7. __________it works: a signal receiver on Earth measures its distance from at least three satellites by recording the amount of time it takes 8. __________(receive) their signals. Then it can calculate its location. With so many satellites, BDS can provide 9. __________more accurate calculation. While GPS provides meterlevel positioning accuracy, BDS reduces the error 10. centimeters. This service is especially useful for land surveying, mapping, agriculture and automated driving. Future plans call for a smarter and more accessible system with Beidou at its core, to e online by 2035. By then, we can probably say that Rome has finally been built. 【文章大意】這是一篇說明文。文章主要介紹了我國自主研發(fā)的北斗定位系統(tǒng), 包括其發(fā)展、作用、運行模式、優(yōu)勢等。1. 【解析】forming?？疾榉侵^語動詞。分析句子成分和句子結構可知, 句中已有謂語動詞have been sent, 無連詞, 可推斷這是一個簡單句, 所以設空處用作非謂語動詞, 在句中充當狀語。設空處與邏輯主語Beidou satellites之間是主動關系, 所以要用現(xiàn)在分詞。故填forming。2. 【解析】began。考查謂語動詞時態(tài)。分析句子成分可知, 句中缺少謂語動詞, 可推斷設空處充當謂語。根據(jù)時間狀語In late 2012可知, 應該用一般過去時。故填began。3. 【解析】launched?？疾榉侵^語動詞。分析句子成分和句子結構可知, 句中已有謂語動詞has, 無連詞, 可推斷這是一個簡單句, 所以設空處用作非謂語動詞, 在句中充當賓語補足語。設空處與邏輯主語Beidou satellites之間是被動關系, 所以要用過去分詞。故填launched。4. 【解析】is expected?？疾楸粍诱Z態(tài)。分析句子成分可知, 句子缺少謂語動詞, 可推斷設空處充當謂語。結合文章時態(tài)可知, 應該用一般現(xiàn)在時。主語it指的是BDS, 與expect之間是被動關系, 所以要用一般現(xiàn)在時的被動語態(tài)。故填is expected。5. 【解析】users?？疾槊~復數(shù)。設空處位于不定式to serve后面, 充當賓語, 且此處指的是全世界的用戶, 所以應該用復數(shù)形式, 泛指多個用戶。故填users。6. 【解析】properly?？疾楦痹~。設空處位于非謂語動詞to run后面, 起修飾作用, 修飾動詞要用副詞形式。故填properly。7. 【解析】how?？疾楸碚Z從句連接詞。句意: 這是它如何運作的(模式)。分析句子成分和結構可知, 句中有系動詞is和謂語動詞works, 可推斷含有兩個句子, 所以設空處需要填入連接詞。從句位于is后面, 是表語從句。根據(jù)后文的描述可知, 這里說明的是運行模式, 即如何運行, 所以要用連接副詞how。8. 【解析】to receive。考查固定句型。分析句子“a signal receiver on Earth measures its distance from at least three satellites by recording the amount of time it takes_______(receive) their signals”可知, 句中含有省略關系詞that/which的定語從句it takes_______(receive) their signals, 修飾先行詞time。關系詞在從句中代替time充當takes的賓語, 此處考查固定句型it takes time to do sth. , 意為“做某事花費多少時間”。故填to receive。9. 【解析】a?？疾楣谠~。句意: 因為有這么多的衛(wèi)星, BDS可以提供一種更精確的計算結果。calculation在句中意為計算結果, 是可數(shù)名詞, 前面沒有限定詞, 無特指, 需要填不定冠詞。more發(fā)音的第一個音素為輔音音素。故填a。10. 【解析】to?？疾榻樵~。句意: 盡管GPS提供到米的定位精確度, 但是BDS把誤差減少到了厘米。根據(jù)句意可知, 此處考查固定表達reduce. . . to意為“減少到……”。故填to。閱讀理解ARobert Jarvik, born on May 11, 1946 in Michigan and raised in Stamford, is a medical scientist and researcher, who played an important role in the invention of the artificial heart. He was interested in medicine from a young age. He watched his father perform operations and gained a patent (專利權) for a machine applied in the medical operation before he graduated from high school. Jarvik attended Syracuse University and considered a career in art. When his father developed heart disease suddenly, he decided then to work on a medical career. He applied to medical schools, but was not admitted to any schools in the US. Before long, he was admitted to the medical school in Italy and stayed there for two years. He returned to get a degree in medicine from New York University in 1971. After working for a period o