搜题请搜索小程序“爱下问搜题”
问题
选择题
—______ there any food in the fridge?
—No, it's empty.
A. Are
B. Is
C. Was
D. Were
答案
答案:
B
单项选择题
实验组间互为对照是
A.空白对照
B.实验对照
C.标准对照
D.自身对照
E.相互对照
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填空题
在平面直角坐标系中,点(-2,-3)在第______象限.
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