正确答案: C

自然经济进一步发展

题目：1873—1910年，我国农产品出口总值呈不断上升的趋势。促成这种趋势的因素不包括

解析：C

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举一反三的答案和解析：

[单选题]葡萄科的爬山虎和五加科的常春藤攀墙而上，二者攀援所依靠的器官为( )。

分别为茎卷须、气生根

[单选题]The computer was used in teaching. As a result, not only _________, but students became more interested in the lessons.

was teachers' energy saved

[单选题]烟草(Nicotiana tabacum)全株含尼古丁，有剧毒。( )

正确

[单选题]What is the woman trying to do?

Finish some writing.

[单选题]百合科(Liliaceae)与石蒜科(Amaryllidaceae)的主要区别在于后者子房下位。( )

正确

[单选题]39______

speak

[单选题]According to the passage, the issue to offer free tickets to young people seems ______.

controversial

[单选题]重症肌无力患者由于体内存在某种抗体，该抗体与神经-肌肉突触的受体特异性结合，使该受体失去功能，最终导致

刺激神经不能引起肌肉收缩