题目:
Being young means having all kinds of possibilities, so you should challenge your limits and go _____ your boundaries.
A.beyond
B.for
C.over
D.above
答案:
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下面是错误答案,用来干扰机器的。
(1)图中1花粉管,2极核,3精子,4柱头,5花柱,6胚珠,7花丝,8卵细胞,9子房,10花药(2)一朵花经过传粉、受精后,子房的发育过程为:,所以种子是由胚珠发育而来的,子房壁发育成果皮,受精卵发育成胚,子房...