modern science and technology has a great effect on our dail

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modern science and technology has a great effect on our daily life
为什么这里的谓语动词要用单数呢

以下是出自BBC的句子,应该是纯正英语,动词用了has,看来science and technology合在一起做单数处理.
To aid the development of science in modern world, bureaucracy and government regulation has been relaxed, and Indian science and technology has moved in a new way.
BBC: NEWS | South Asia | Science 'can lift India's poor'

modern science and technology has a great effect on our dail 6.Modern science and technology has __ communication between Modern science and technology has __ communication between p Modern science and technology has _ communication between pe the development.of modern science and technology has brought 短文：Albert Einstein had a great effect on science and history Albert Einstein had a great effect on science and history,gr modern science and technology plays a vital role in the soci As the development of modern science and technology,some asp With the development of science and technology,the modern ae With the rapid development of modern science and technology, 2、With the development of modern science and technology,the