B. Its distribution.

D. Its development.

C. Its quantity.

33. Why was it difficult for ancient human adults to producelabiodentals?

A. They had fewer upper teeth than lower teeth.

B. They could not open and close their lips easily.

C. Their jaws were not conveniently structured.

D. Their lower front teeth were not large enough.

34. What is paragraph 5 mainly about?

A. Supporting evidence for the research results.

B. Potential application of the research findings.

C. A further explanation of the research methods.

D. A reasonable doubt about the research process.

35. What does Steven Moran say about the set of human speech sounds?

A. It is key to effective communication.

B. It contributes much to cultural diversity.

C. It is a complex and dynamic system.

D. It drives the evolution of human beings.

第二节(共 5小题;每小题 2.5分，满分 12.5分)

阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选

项中有两项为多余选项。

Fitness Magazine recently ran an article titled “Five Reasons to Thank

Your Workout Partner.” One reason was: “You’ll actually show up if you

know someone is waiting for yoat the gym,” while another read: “ 36 ”

With a workout partner, yowill increase your training effort as there isa

subtle (微妙) competition.

So, how do yofind a workout partner?

First of all, decide what yowant from that person.

37

Or do you

just want to be physically fit, able to move with strength andflexibility?

Think about the exercises yowould like to do with your workoutpartner.

Yomight think about posting what yoare looking for on social media,

but it probably won’t result in a useful response. If yoplan on

38

working out in a gym, that person must belong to the same gym.

My partner posted her request on the notice board of a local park. Her

notice included what kind of training she wanted to do, how many days a

week and how many hours she wanted to spend on each session, and herage.

It also listed her favorite sports and activities, and provided herphone