题目内容

A．studiedB．researchedC．tookD．learned

A. studied
B. researched
C. took
D. learned

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A．behindB．middleC．headD．front

A. behind
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A．reflectionB．justiceC．tasteD．color

A. reflection
B. justice
C. taste
D. color

What Kemmons' mom often told him during his childhood was______.

A. caring
B. moving
C. encouraging
D. interesting

According to the passage , the greatest challenge to the new high-speed railway plan is______.

A. technical issues
B. safety of the system
C. financial problems
D. maintenance of railway tracks