A.gas-fired power plants.
B.coal-fired power plants.
C.water generated power plants.
D.wind-generated power plants.


A.the U.S. Senate passed laws requiring federal mine inspections.
B.the U.S. Congress passed laws requiring federal mine inspections.
C.the U.S.health and safety officials passed laws requiring federal mine inspections.
D.the U.S. mine companies passed laws requiring federal mine inspections.
A.Russia.
B.India.
C.France.
D.China.
A.A competition is held to draw talented students to aerospace career.
B.It has the leading position in the space field.
C.A global rocket launch program is held by engineering students.
D.It is losing its competitive edge in the aerospace industry.