问题
选择题
Students should be encouraged to use ____ Internet as ____ resource. [ ]
A. 不填; a
B. 不填; the
C. the; the
D. the; a
答案
答案：D
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Students should be encouraged to use ____ Internet as ____ resource. [ ]
A. 不填; a
B. 不填; the
C. the; the
D. the; a
答案：D
，
）
，求细线AC与竖直方向的夹角；