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ngoccutecr152
2 năm trước
Trung bình cộng số tuổi của bố, an và tuổi hồng là 19 tuổi. Tuổi bố hơn tuổi của an và Hồng là 13 tuổi, hồng kém an 4 tuổi. Tính tuổi mỗi người.
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1. In 1886 in the United States, a pharmacist named Dr. John Pemberton tried to invent a medicine because he wanted a cure for___ A. headache B. headaches C. a headache D. the headaches 2. The key___inventive success often requires being in the right place at the right time. A. for B. of C. in D. to 3. An invention developed____one purposed will sometimes find use in entirely different circumstances. A. in B. with C. by D. for 4. Charles Macintosh, an amateur chemist, was experimenting with coal-tar naphtha, a chemical waste product, and realized that it was a powerful solvent that___a solution from rubber. A. will make B. would make C. can make D. could make 5. The invention of the telephone ____the beginning of a new era in communication technology. A. mark B. marks C. marked D. marking 6. It is the classical Athenians who can probably lay claim___the invention of commercial advertising as we know it today. A. to B.for C. of D. with 7. _____with the internet, which is a system of linked computer networks, the worldwide web was invented by British computer scientist Tim Berners-lee. A. Not to confuse B. Not to be confused C. To be not confused D. Confused not to be 8. Both inventors and engineers look for ways to improve things in areas like health, food, safety, transportation, aerospace, electronics,___, and the environment. A. communication B. communicative C. communicator D. communicating 9. The European Patent Convention, which was implemented in 1977, created a European Patent Office that can issue___European patent. A. a B.an C.the D.X 10. The first American____the propelling of a boat by steam was William Henry, a gunsmith of Lancaster, Pennsylvania. A. attempt B. to attempt C. attempting D. attempted

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