问题
选择题
It was yesterday afternoon _____ we had a meeting in the meeting room. [ ]
A. that
B. when
C. in which
D. at which
答案
答案：A
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It was yesterday afternoon _____ we had a meeting in the meeting room. [ ]
A. that
B. when
C. in which
D. at which
答案：A
，①能被培养成为④的根本原因是___________。这个过程中需要用到________(激素)；②表示_______，它的特点是_________________。