—About half an hours walk. Let’s go and visit it.

　　A. How far B. How long

　　C. How many D. How much

　　[解析]

　　根据答句“大约步行半小时的路程”，可知问句应该是询问“距离”， 用how far.选A.

　　2. The heavy snowstorm made the mountain climbers halfway.

　　A. stop B. to stop

　　C. stopping D. stopped

　　[解析]

　　make sb. do sth.意为“让某人做某事”，make后面接不带to的动词不定式作宾语补足语。选A.

　　3. —Do you think English is more important than Chinese？

　　—I don‘t think so. I think English is important Chinese. We should study both well.

　　A. too， to B. as， as C. so， that D. so， as

　　[解析]

　　结合上下文可知，答句要表达的意思是“我认为英语和汉语同样重要”。“as + 形容词或副词原形 + as”意思是“和……一样”。选B.

　　4. The air in Beijing is getting much now than a few years ago.

　　A. clean B. cleaner

　　C. cleanest D. the cleanest

　　[解析]

　　由句中的than可知这是一个比较级句型。比较级前可以用much， a lot， a little等词来修饰。选B.

　　5. the students in their school over two thousand.

　　A. The number of， is B. The number of， are

　　C. A number of， is D. A number of， are

　　[解析]

　　a number of意思是“许多的；大量的”，后接复数名词作主语时谓语动词用复数。the number of意思是“……的数目”，后接复数名词作主语时谓语动词用单数。结合句意可知， 此处指“学生的数目”。选A.