A laser beam consists of a ________ of pure light.
Giải bởi Vietjack
Chọn đáp án B
Almost every language in the world has dialects and American English is no ________
China is a huge country, containing a ________ of culture and ________ of landscape.
Laura failed to give ________ reasons for her ________ from the meeting yesterday.
Vitamin D helps us not only build ________ teeth and bones but also absorb calcium.
We are in ________ of the campaign to end illiteracy among teenagers.
It is important to protect landscapes from the harmful effects of ________ pollution.
