1.Some one called me up in the middle of the night,but they hung up________ I could answer the phone.

　　 A.as B.since C.until D.before

　　 (NMET 2000)

　　 命题意图：本题主要考查连词的语意，但需结合时间，尤其是前后两个动作发生的先后顺序，故难度较大。本题属五星题。

　　 知识依托：as 引导时间状语从句，意思是当……时，since 自从，until直到……，before在……之前。答案选D。

　　 错解分析：错误的原因在于没有了解相关动作发生的先后关系，they hung up发生在I could answer the phone之前，题目的意思是：半夜里有人给我打电话，但我还没来得及接/在我能接电话之前，他们就挂掉了。

　　 解题方法与技巧：解关于从属连词的题首先要了解各自的语意；在处理习题时，还要结合上下文的语境和结构来进行综合确定。

　　 答案：D

　　 ●锦囊妙计

8.(★★★★)The difficulty we now are facing is the question________ we can persvade him to tell the truth.

　　 A.that B.whether C.what D.how

　　 ●案例探究

7.(★★★★★)After the war,a new school building was put up________ there has once been a theatre.

　　 A.that B.where C.what D.who

6.(★★★★)The reason________ their failure you know is________ they didn’t get fully prepared for the experiment. (福州毕业班质检题)

　　 A.why;that B.that;why C.for;that D.why;because

5.(★★★★★)-My foot hurts terribly,doctor.

　　 -Well,I wonder________ it has been like this.

　　 A.since when B.since then C.how D.when

4.The WTO cannot live up to its name________ it does not include a country that is home to one fifth of mankind.

　　 A.as long as B.while C.if D.even though

3.(★★★★★)It is at least three years________ they left here.

　　 A.when B.before C.since D.that

2.(★★★★)The thought________ he might fail in the exam worried him.

　　 A.when B.which C.what D.that

1.(★★★★)________ the new plan can be carried out will be discussed at the meeting tomorrow.

　　 A.Which B.What C.That D.Whether

31.(4分)在研究“电磁铁的磁性强弱跟什么因素有关”时，小华和小杰从实验室选取了匝数分别为50匝和100匝的外形相同的电磁铁，并先后将这两个电磁铁接入电路中，如图所示.闭合开关S后用电磁铁吸引大头针，并移动滑动变阻器的滑片P重复了多次实验，记录如下：

　(1)实验中，可通过观察____来判定电磁铁的磁性强弱.

　(2)分析第1、4次和2、5次的实验可得出结论：在____相同的情况下，线圈的匝数越____磁性越强.

　(3)分析第4、5、6次的实验记录，可得出结论：____.