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【多选题】
Which of the following statements are the drawbacks of the bottom-up model?A.
The bottom-up process is to break the whole (natural) language into bite-sized, abstract little pieces, and this would make learning to read difficult.
B.
The readers will simply become "word callers" who can read the words on the page but do not understand what they have read.
C.
With the bottom-up model, readers can read classical Chinese essays and pronounce all of the words that they are reading, but they may have no comprehension of what they have read.
D.
The readers will get the details of the reading materials.
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举一反三
【单选题】植物溶液培养中的离子颉颃是指
A.
．化学性质相似的离子在进入根细胞时存在竞争
B.
．电化学性质相似的离子在与质膜上载体的结合存在竞争
C.
．在单一盐溶液中加入另外一种离子可消除单盐毒害的现象
D.
．根系吸收营养元素的速率不再随元素浓度增加而增加的现象