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【单选题】
15疏松结缔组织分子筛的构成成分主要是A.
透明质酸和胶原原纤维
B.
硫酸软骨素和蛋白质
C.
糖胺多糖和蛋白质
D.
胶原原纤维和蛋白质
E.
糖蛋白和透明质酸
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反馈参考答案：
举一反三
【简答题】We keep it to keep the door.
【简答题】We don’t keep winning s _______ we keep playing well. A. because B. unless C. when D. while
【单选题】We don’t keep winning games _______ we keep pla
A.
2. We don’t keep winning games _______ we keep playingwell. （浙江） A.because
B.
unless
C.
when
D.
while
【单选题】Now people can with their friends far away by e–mail, cellphone or letter.
A.
keep on
B.
keep in touch
C.
keep up
【单选题】We now ______ him by writing letters.
A.
keep away from
B.
keep on
C.
keep in touch with
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