第1题
A.iron
B.to iron
C.ironing
D.being ironed
第2题
A.It directed air at melted iron in a furnace, removing all impurities.
B.It could quickly find deposits of iron ore under the ground.
C.It slowly heated iron ore, then stirred it and heated it again.
D.It changed iron ore into iron, which was a substitute for steel.
第4题
Any kind of iron in the food is a contributor to the development of breast cancer.
A.Right
B.Wrong
C.Not mentioned
第6题
What is the oxidation state of iron in pyrites, FeS2? Is the anion diatomic? What physical measurements could be performed to test this hypothesis?
第7题
The children went there to watch the iron tower______.
A.being erected
B.to erect
C.be erected
D.erecting
第8题
A.more beautiful
B.new and modern
C.much stronger
D.easier to transport
第9题
He was hit on the head by a piece of iron and was knocked ______ .
A.unconscious
B.subconscious
C.mindless
D.brainless