搜题请搜索小程序“爱下问搜题”
问题 判断题

异面叶的上表面的颜色通常较下表面深，是因为靠上表面的叶肉组织为栅栏组织，含叶绿体较多。

答案

参考答案：对

选择题
Dr. Smith, together with his wife and daughters, _____ visit Beijing this summer.

A. is going to
B. are going to
C. was going to
D. were going to
查看答案
问答题

如图所示，A、B为保险盒，C为开关，D为螺丝口灯泡，E为接大功率用电器的三孔插座．请把这些元件接入家庭电路中．
查看答案