玉米螟一年发生几代?
参考答案:
玉米螟一年发生1-7代。
Although she is pretending hard to be young, grey hair and the lines on her face _______.
A.give her away
B.pick her up
C.take her away
D.hold her up
哪一钟不是脂溶性维生素()
A.维生素A
B.维生素D
C.维生素E
D.维生素B