高；改善"。句意：若想成功，那么知识与学习就很重要，但他们或许也会限制我们的思维。由此可知B项符合句意。

　　8．(2010·江苏高考)-Is everyone here?

　　-Not yet ... Look, there ________ the rest of our guests!

　　A．come B．comes

　　C．is coming D．are coming

　　解析：选A。考查动词的时态和主谓一致。空处所在句子为倒装句，the rest of our guests作主语，谓语动词要用复数形式；此处叙述的又是现在的事实，所以用一般现在时。

　　9．________ you use the Internet a lot, especially to download a large file, the increased speed may be a big benefit.

　　A．Until B．Although

　　C．Whether D．If

　　解析：选D。考查状语从句。句意：如果你经常使用因特网，尤其是下载大的文件，网速增加可能会有很大的益处。由句意可知，此处用if引导条件状语从句。

　　10．- Shall we go to the lecture about the risk of brain cancer from mobile phone use?

　　- ________？ It is closely related to our health.

　　A．What if B．Why not

　　C．What for D．How come

　　解析：选B。考查交际用语。句意："我们去听关于使用手机会导致脑癌的讲座，好吗？""为什么不呢？它和我们的健康息息相关。"Why not表示同意对方的提议。What if"要是......会怎么样呢"；What for"为何目的"；How come"怎么会"。

　　Ⅳ.阅读理解

　　The European Union announced plans on Tuesday to temporarily ban the use of animal cloning for food production, while allowing imports of food derived from the offspring (后代) of clones from the United States and elsewhere.

　　The report from the European Commission followed a call by EU lawmakers in July for a total ban on food derived from cloned animals and their traditionally bred offspring, citing ethical concerns over the industrial production of cloned meat.

　　The Commission said a temporary five­year EU ban on cloning for food production was justified on animal welfare grounds, but said banning imports of food from the offspring of clones was unnecessary and would disrupt global trade.

"Food from cloned animals is safe.In fact, the scientific opinion is that it cannot be