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【判断题】
甘草酸的苷元以及所连接额糖上均含有羟基,在碱液中易溶,而在酸性溶液中则易沉淀。A.
正确
B.
错误
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举一反三
【单选题】We usually cover the Christmas trees ____ colour lights. [ ]
A.
in
B.
use
C.
for
D.
with
【单选题】—What can we cover the roof _______? —The rain is too heavy. [ ]
A.
in
B.
with
C.
on
D.
for
【简答题】A. cover B. spread C. help D. pass
【单选题】The wild flowers looked like a soft orange blanket ________ the desert. A. covering B. covered C. cover D. to cove
A.
covering
B.
covered
C.
cover
D.
to cover