We have not been contacted by an alien civilization because of the insufficient development of the science and technology.
举一反三
- Space exploration has been made _____ with the development of modern science and technology.
- With the development of science and technology, the prices of TV sets have ___. A: gone down B: been gone down C: brought down D: been gone up
- Much attention must ______ to the development of science and technology. A: pay B: to pay C: be paid D: have paid
- National strength relies on the development of science and technology.
- Much attention must (pay) ________ to the development of science and technology.