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【多选题】
维生素 B2 的缺乏症包括 ( )A.
口角炎
B.
眼部症状
C.
神经症状
D.
皮炎
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举一反三
【单选题】No one likes to eat with a dirty knife, fork, or spoon. It is important to completely wash all utensils before using them. Clean utensils won’t transmit germs and bacteria. They also are more pleasant...
A.
No one likes to eat with a dirty knife, fork, or spoon.
B.
It is important to completely wash all utensils before using them.
C.
Clean utensils won’t transmit germs and bacteria.
D.
They also are more pleasant to eat with.
【单选题】将 18.6g 某非电解质溶于 250g 水中,溶液凝固点为 -0.744 ̊C ,则该溶质的相对分子量为( )
A.
186
B.
93.0
C.
298
D.
46.5
【单选题】What kind of spoon is often used to eat desserts?
A.
Soup spoon
B.
Tea spoon
C.
Dessert spoon
D.
Salad spoon
【单选题】______he was tired,______he didn’t stop______.
A.
Although ; but; to rest
B.
/; but; to work
C.
Although;/; rest
D.
Although;/; working
【单选题】________ he is ill, ________he goes to school.
A.
Although; but
B.
/; /
C.
Although; /
【单选题】将0.45g某非电解质溶于30g水中，溶液凝固点为－0.15℃。已知水的Kf= 1.86 K·kg·mol－1，则该非电解质的摩尔质量(g·mol－1)约为（ ）。
A.
100
B.
83.2
C.
186
D.
204
【单选题】___________he is poor,________he is happy.
A.
Although;/
B.
Although; but
C.
But; although
D.
/; /
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