题目:
Scientists at the Los Alamos National Laboratory have succeeded for the first time in mining heat from the Earth's interior and producing energy on a commercial scale, enough for efficient generation of electricity and heating factories and homes.
选项:
A、 and producing energy on a commercial scale, enough for efficient generation of electricity and heating
B、 and producing enough energy on a commercial scale for electricity to be generated efficiently and to heat
C、 for energy production on a commercial scale, enough for generating electricity efficiently and to heat
D、 to produce energy on a commercial scale, enough for generating electricity efficiently and for heating
E、 to produce enough energy on a commercial scale for efficient generation of electricity and heat
答案:
D