小明家的苹果树枝繁叶茂，却在形成花蕾以后出现落蕾现象。小明根据所学生物学知识及时给苹果树施加了适量的化肥以后，就不再出现落蕾现象，并且不久开花了。请问小明施加的化肥是
| A．氮肥 | B．磷肥 | C．钾肥 | D．氮肥和钾肥 |
相关试题
I can't see Lucy because she is _______ the tree．（ ）
| A． |
in front of |
| B． |
behind |
| C． |
next to |
Mike lost his school ID card this morning．He is looking for _____ now．（ ）
| A． |
it |
B． |
him |
C． |
them |
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