This is a special clock. A team from China made it.

It is the world’s smallest chip atomic (原子的) clock. It is smaller than a finger. It is also very accurate (精确的) — it only goes wrong less than 1 second in 30,000 years.

This tiny clock can help us in many ways. It can work in small satellites up in the sky. It can also help drones (无人机) fly together in groups, or guide machines under the water.

1.1.This special clock is made by a/an ______ team.

A Japanese

B Chinese

C American

D English

解析：选B。B细节理解题。根据第一段的“A team from China made it.”可知这个特殊的时钟是由一个来自中国的团队制造的。故选B。

2.2.The clock is smaller than a ______.

A finger

B book

C bag

D desk

解析：选A。A细节理解题。根据第二段的“It is smaller than a finger.”可知这个芯片原子钟比手指还要小。故选A。

3.3.The clock can guide under the ______.

A water

B sky

C ground

D grass

解析：选A。A细节理解题。根据第三段的“or guide machines under the water”可知，该时钟可用于水下机器导航。故选A。

4.4.China’s new clock may ______ how machines work.

A stop

B find

C lose

D change

解析：选D。D细节理解题。根据最后一段的“China’s new clock may change how machines work in the future!”可知，这款新时钟可能会改变机器的工作方式。故选D。