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【单选题】
（）是参与调节钙、磷代谢，促进骨的生长和骨组织的矿质化。缺乏它将降低对钙、磷的吸收及利用能力，发生佝偻病、软骨病等。A.
维生素A
B.
维生素D
C.
维生素E
D.
维生素B族
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【单选题】D Sitting on the peaceful coast of Galapagos Islands. Ecuador, watching the sun move quietly into the sea, you shouldn’t forget that Charles Darwin (1809-1882) arrived here in 1835. He stayed on the i...
A.
He studied different creatures on the islands
B.
He completed his famous book on the islands
C.
He was touched by the geography of the islands
D.
He was attracted by well-know animals of the islands
【单选题】The scientist began his talk as soon as we_____. [ ]
A.
were sitting
B.
were seated
C.
seated
D.
had seated
【简答题】There were already four people sitting in the car, but we tried to make a room for her.
【简答题】阅读理解。 Sitting across from a German couple and a Chinese mother and her child, we were waiting at the Guilin airport for our delayed flight to Shanghai. In this last week of our travel study tour, my h...
【单选题】There were already four people sitting in the car ，but we tried to _____ for her .
A.
make room
B.
make a room
C.
find rooms
D.
find a room
【单选题】There was a (an) __________ silence between us after we were left alone in the sitting-room.
A.
awkward
B.
angry
C.
adequate
D.
patient
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