单项选择题
1、 With the guide__________the way, we set out on foot into the dark night.
A．lead
B．leading
C．led
D．to lead


2、 人民军队的一宗旨，也是其区别于旧军队的根本标志是(    )
A．官兵一致
B．批评和自我批评
C．全心全意为人民服务
D．打仗、筹款、做群众工作


3、下列作品中，属于汉代乐府民歌的是(   )
A．《陌上桑》
B．《诗经·氓》
C．《短歌行》(其一)
D．《杜陵叟》


4、 设函数y=e^-x，则y＇等于(　　)．
A．-e^x
B．e^x 
C．-e^-x
D．e^-x


5、根据下面内容，回答题：
Gold used in jewelry is mixed with harder metals to add strength and durability. The metals added can also be used to change gold' s color, giving it a fashionable rose or white tint, or to lighten or darken the natural yellow, tone of pure gold.Mixtures like these, of less costly metals with more valuable ones, are called alloys. Copper and silver are the most common metals mixed with gold to make yellow gold jewelry. White gold is usually made with an alloy of gold and nickel.
The measure of gold' s purity is called a karat. The higher the karat rating,the higher the amount of pure gold: 24 karat is pure gold,18 karat is 75% pure gold,14 karat is 58.5% pure gold, and 9 karat is 37.5% pure gold. All other things being equal ,the higher the percentage of pure gold used in the alloy,the more valuable and expensive the jewelry wll be.
Gold jewelry pieces are usually stamped with a marking to identify the karat amount. While gold that is 24K is too soft for jewelry,18K,14K and 9K gold are all appropriate for jewelry, and they all make pieces that look great and wear beautifully.

Which of the following statements best.captures the main idea of this passage?
A．Although gold is very valuable,it is also very expensive.
B．Gold jewelry is stamped with its karat ,weight.
C．Gold jewelry is made using alloys.
D．Colored gold is more valuable than white gold.


6、 甲有一辆自行车，因其被调到公司驻外地的办事处工作，该自行车闲置，便暂时借给乙使用。后来乙因故辞职回老家，临走之前将该自行车卖给了丙。按照我国法律的规定，乙的行为属于（　　）。
A．有效的民事行为
B．无效的民事行为
C．可撤销的民事行为
D．效力待定的民事行为


填空题
7、 生物量是指__________动物、植物等生物的总重量。


8、


简答题
9、阅读《宝玉挨打》中的一段文字，然后回答小题。
贾政冷笑道：“倒体提这话。我养了这不肖的孽障，已不孝；教训他一番，又有众人护持；不如趁今日一发勒死了，以绝将来之患!”说着，便要绳索来勒死。王夫人连忙抱住哭道：。t老爷虽然应当管教儿子，也要看夫妻分上。我如今已将五十岁的人，只有这个孽障，必定苦苦的以他为法，我也不敢深劝。今日越发要他死，岂不是有意绝我。既要勒死他，快拿绳子来先勒死我，再勒死他。我们娘儿们不敢含怨，到底在阴司里得个依靠。”说毕，爬在宝玉身上大哭起来。贾政听了此话，不觉长叹一声，向椅上坐了，泪如雨下。
这段文字主要描述的内容是什么?(2分)


10、

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