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【简答题】
阅读下面短文，回答下列相关问题． 森林里生活着高大的乔木、低矮的灌木、草本植物．有许多鸟类在此栖息，有的鸟吃草籽，有的鸟是杂食性鸟（既吃草籽又吃昆虫）．昆虫又吃植物的茎和叶．有些鼠类以植物的茎、叶、果实为食物，然而鼠又是狐和鹰的食物，鹰也捕食鸟． （1）图中一共有______条食物链． （2）该食物网中未表示的生物成分是______，若要组成一个完整的生态系统，还需补充的成分是______． （3）在这个食物网中，杂食性鸟与昆虫的关系是______关系． （4）在该生态系统中，______和______是沿着食物链和食物网流动的．
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【单选题】It's five years ____ my dear aunt ____ here.
A.
before; has left
B.
since; left
C.
before; is left
D.
since; had left
【单选题】— It's five years since I worked here. — _______? [ ]
A.
Have you worked here happily
B.
How long will you work here
C.
Where do you work now
D.
Do you want to work here longer
【单选题】It's five years _______ our teacher came to Jiangyan. [ ]
A.
since
B.
when
C.
although
D.
if
【单选题】It's five years since my dear aunt _____ here. [ ]
A.
left
B.
has left
C.
is left
D.
had left
【单选题】It's almost five years___we saw each other last time.
A.
before
B.
since
C.
after
D.
when
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