皮皮学，免费搜题
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【单选题】
When the writer says 'critical period'， he means a period when __________. 查看材料A.
studies produce useful results
B.
adults need to be taught like children
C.
language learning takes place effectively
D.
immigrants want to learn another language
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皮皮学刷刷变学霸
举一反三
【单选题】We can ’ t _____ examination not because it it the best system, but rather because we have not _____ a better way to evaluate students.
A.
do away, come up with
B.
do away from, come across with
C.
do away with, come up with
D.
do away to, come across
【简答题】已知下列命题 : “ 有些犯罪不是故意犯罪。 ” 为真,请指出其同素材的另外三个性质命题的真假。