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【简答题】
（1）青少年正处于生长发育时期，每天需要摄取足量的蛋白质，蛋白质的代谢产物中含有尿素．[尿素的化学式为CO（NH 2 ） 2 ]，请根据尿素的化学式计算：（只写结果）①尿素的相对分子质量 ________ ．②尿素中含有 ______ 种元素，其中碳元素和氮元素的质量比为_________．③尿素中氮元素的质量分数为 _________ ． （2）尿素和碳酸氢铵（NH 4 HCO 3 ）是常见的氮肥．根据资料：某地尿素的市场价格为2500元/t，碳酸氢铵的市场价格为800元/t．若分别用10000元采购尿素和碳酸氢铵，请通过计算说明哪种化肥所含氮元素的质量多_______________________．
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举一反三
【单选题】__________ the poem a second time, the meaning will become clearer to you. [ ]
A.
Your having read
B.
While reading
C.
If reading
D.
When you read
【简答题】不违农时，谷不可胜食也 胜：
【单选题】听力原文：W: I wish Susie would stop reciting that poem. I've heard her repeat it hundreds of times. M: At least that much. I used to really like Whitman's poems until I had to listen to her over and over ...
A.
They are tired of hearing the poem.
B.
They are very excited to hear Whitman's poems.
C.
Susie is one of their favorite.
D.
They want to listen to Susie's recitation of the poem.
【单选题】This poem depicts the beautiful scenery of a small town in the South.
A.
describes
B.
draws
C.
writes
D.
introduces
【单选题】Which poem was NOT written by W. H. Auden?
A.
For the Time Being.
B.
The Age of Anxiety.
C.
Another Time.
D.
The Waste Land.
【单选题】---It seems that she is thinking about something． ---Yes, she cannot remember what key she ____ to her computer．
A.
．set
B.
．has set
C.
．had set D． sets
【简答题】不违农时,谷不可 胜 食也。
【单选题】Though the poem is well-known, no one has yet been able to ________its author.
A.
render
B.
glare
C.
confide
D.
trace
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