Exercices de Anglais : Science & progress

Read the sentences about scientific progress and fill in the blanks using the Past Simple of the verbs in brackets. 1. In 1903, the Wright brothers ________ (fly) the first motor-powered airplane. 2. Alexander Graham Bell ________ (invent) the telephone in 1876. 3. Scientists ________ (discover) many new vaccines in the $20^{th}$ century to improve health. 4. Computers ________ (become) smaller and faster over the last few decades.

Read the following text and perform the requested tasks: 'By the year $2050$, the implementation of advanced electric propulsion systems is expected to reduce urban pollution. An electric vehicle travels at an average speed of $60 \text{ km/h}$ for a duration of $2.5 \text{ hours}$. Calculate the total distance ($d$) covered by this vehicle. Furthermore, explain why the use of solar energy, represented as $E_{solar}$, is considered a better alternative to burning fossil fuels which release $CO_2$ into the atmosphere.'

Read the following scenario and write an argumentative paragraph. Scenario: Scientists have developed a new technology to edit human genes, known as CRISPR-Cas9, which uses an enzyme system to cut DNA sequences at specific locations. While this could eradicate genetic diseases like $Cystic Fibrosis$ (caused by a mutation in the $CFTR$ gene), it raises the possibility of 'designer babies'. You are a student journalist. Write a text of 120-150 words in English discussing the impact of this innovation. You must use at least two modals of probability (e.g., $might$, $could$), one conditional structure (e.g., $if$, $would$), and mention one scientific benefit and one ethical risk.