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【单选题】
图一表示某生态系统的食物网，甲～代表不同的生物。下列有关叙述中正确的是 [ ]A.
图一中的甲和己各代表一个营养级
B.
调查图一中的戊和的种群密度一般用标志重捕法
C.
当丙刚迁入这个生态系统的一段时间内，数量变化如图二中的曲线X
D.
若图二中的曲线Y代表的是该生态系统中丁的数量变化，则C点对应的是图三中的t 1 时刻，此时丙的出生率等于死亡率
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【单选题】A great number of people have stopped buying the product ________ the fact that it is safe.
A.
for fear of
B.
on account of
C.
in spite of
D.
as a result of
【单选题】What's experts' opinion about taking vitamin pills?
A.
It is safe for our health.
B.
It does more good than harm.
C.
It may bring us some side effects.
D.
It will reduce the length of colds.
【单选题】缩宫素的临床应用：
A.
小剂量缩宫素可用于引产和催产
B.
小剂量缩宫素可用于产后止血
C.
缩宫素具有抗利尿活性，可用于治疗尿崩症
D.
临床应用与麦角类生物碱相似
E.
抑制乳腺分泌
【简答题】A．The sea can hardly be trusted even on a fine day. B．It is not safe for people to go boating in the open sea. C．People who know the sea well do not like it. D．Mr. Johnson wouldn't want to go to the s...
【单选题】It is safe to infer from the passage that ______.
A.
lateral thinking is useful for creative problem-solving
B.
a lateral thinker is free from the restraint of assumptions
C.
lateral thinking can produce better and more effective solutions to problem than vertical thinking
D.
both Aand B.
【简答题】Blank 1
【简答题】直流电动机根据励磁方式分类 [Blank 1] [Blank 2] [Blank 3] [Blank 4]
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