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【单选题】
在由Na 2 S、Na 2 SO 3 、Na 2 SO 4 组成的固体混合物中，已知S的质量分数为25．6%，则氧的质量分数为 [ ]A.
36．8%
B.
37．6%
C.
51．2%
D.
无法计算
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【单选题】— _____ won the 100th gold at the Olympics for China? — Zhang Yining. She's from Beijing. [ ]
A.
Who
B.
What
C.
When
D.
Where
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【单选题】____child who won the piano contest was so_____to us.
A.
The...inspires
B.
..inspired
C.
The...inspiring
D.
The...inspired
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【单选题】Good teachers matter. This may seem obvious to anyone who has a child in school or, for that matter, to anyone who has been a child in school. For a long time, though, researchers couldn’t actually pr...
A.
good teachers help students establish confidence.
B.
good teachers determine the personality of students.
C.
good teachers promote student achievement.
D.
good teachers treat students as their own children.
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【简答题】Change the nouns below into plural forms and group them according to the pronunciation of their endings.
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