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【单选题】
下图为一个陆地生态系统食物网的结构模式图，下列叙述中不正确的是 [ ]A.
属于次级消费者的生物有丁、己、戊
B.
若发生重金属污染，则重金属积累最多的生物是
C.
有5条食物链，与丁竞争最为激烈的是丙
D.
若戊的种群数量增加，则的种群数量不一定增加，丁的种群数量将减少
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举一反三
【单选题】He doesn't (say) in his letter (that) he's going to (be back) (or not).
A.
them
B.
that
C.
be back
D.
or not
【简答题】A Letter to a Friend 1．Telling his friend that he was pleased to be admitted to Yale University17． A Letter to a Friend 1．Telling his friend that he was pleased to be admitted to Yale University 2．Me...
【单选题】He doesn't (say) in his letter (that) he's going to (be back) (or not).
A.
say
B.
that
C.
be back
D.
or not
【简答题】A．Put a stamp on the letter. B．Make his letter shorter. C．Keep working on the letter. D．Send the letter as it is.
【单选题】Last summer the author got a letter from a man asking to cancel his wife's subscription.
A.
Y
B.
N
C.
NG
【单选题】--Why did he cry yesterday?--He was excited, for he ______ his mother’s letter.
A.
expected
B.
was expecting
C.
had expected
D.
had been expecting
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