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【单选题】
下列关植物激素的叙述，正确的是 [ ]A.
植物生长调节剂是指生长素类似物
B.
2，4-D能调节植物生长，也是植物激素
C.
乙烯是一种气体，不属于植物激素
D.
赤霉素能促进种子萌发和果实发育
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举一反三
【单选题】______,there was a revival in literacy.
A.
The early Middle Ages
B.
The late Middle Ages
C.
The Middle Ages
D.
None of all
【单选题】How does the writer value art of the Middle Ages?
A.
The art of the Middle Ages is elevated by its religious and sacred facet.
B.
Artists of the Middle Ages were absolutely talented
C.
The art of the Middle Ages formed its own unique system.
D.
The religious works in the Middle Ages reached unparallel height in art.
【单选题】When were the images of Mars taken?
A.
In the middle of summer on Earth.
B.
In the middle of summer on Mars.
C.
In the middle of summer on Earth's polar caps.
D.
In the middle of summer in the northern part of Mars.
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