Some people speak with a stutter (口吃). Sometimes they can’t say some words ___1___ (clear). Sometimes they say the same word many ___2___ (time). Sometimes they stop for a short time when they speak.

More than 70 million people stutter around ___3___ world. 5% of the children stutter at some time in ___4___ (they) lives. Some people stutter all their life.

Scientists say that ___5___ (that) people have different brains. Also, more people in the same family stutter. It is common. Men stutter ___6___ (much) often than women.

1.1.

A

B

C

D

解析：选clearly。clearly 考查副词修饰动词。空格前的“say”是动词，需要用副词来修饰，clear的副词形式是clearly，表示“清楚地说”。

2.2.

A

B

C

D

解析：选times。times 考查可数名词复数。many 后面接可数名词复数，time 表示“次数”时可数，复数形式为 times。

3.3.

A

B

C

D

解析：选the。the 考查定冠词用法。“around the world”是固定搭配，表示“全世界”，world 前需加定冠词 the。

4.4.

A

B

C

D

解析：选their。their 考查物主代词。空格后是名词 lives，前面需要物主代词，they 的物主代词是 their，表示“他们的生活”。

5.5.

A

B

C

D

解析：选those。those 考查指示代词。空格后是复数名词 people，that 的复数形式是 those，指代前文提到的“口吃的人”。

6.6.

A

B

C

D

解析：选more。more 考查比较级。空格后有 than，表示比较，much 的比较级是 more，构成“more often than”。

7.7.

A

B

C

D

解析：选that。that 考查宾语从句的引导词。空格前的 know 是及物动词，后接宾语从句；宾语从句 “they can’t change their brain” 句意完整、成分齐全（主谓宾结构完整），无需疑问意义的引导词。根据语法规则，此类宾语从句的引导词用 that，that 可省略，但此处为填空考查，需补全引导词，故填 that。

8.8.

A

B

C

D

解析：选is。is 考查主谓一致。主语是 what they say（一个主语从句），视为单数概念，谓语动词用单数 is。