皮皮学，免费搜题
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【单选题】
人体内必需的含硫氨基酸是A.
Cys
B.
Val
C.
Met
D.
胱氨酸
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举一反三
【简答题】What did the thief take from the shop?
【单选题】— What did you do this morning? — I went _____. [ ]
A.
shop
B.
shops
C.
to shop
D.
shopping
【简答题】单位长度的光学密度D0和____正相关
【简答题】元组解包的概念?举例说明?(每问 3 分,共 6 分)
【简答题】厚度为 2.0m 的烟气层, 测得 有 30% 的光穿过,计算单位厚度上烟气的光学密度为( )及烟气的消光系数为( ) m -1 。结果保留三位有效数字,不用写单位。
【单选题】What is special about the shop's service?
A.
The shop guarantees the battery for a year.
B.
The man will clean it at no extra charge.
C.
The man can repair watches very quickly.
D.
The shop is offering a special discount.
【单选题】—What’s Jack up to in the shoe shop? He’s there for ages. —It’s ______ that he hasn’t decided which pair to buy.
A.
sure
B.
obvious
C.
confusing
D.
curious
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