A. to
Đáp án A
Cụm từ: key to + noun/ Ving ( chìa khóa để làm gì đó)
In a world where 2 billion people live in homes that don't have light bulbs, technology holds the key (31)______ banishing poverty. Even the simplest technologies can transform lives and save money. Vaccines, crops, computers and sources of solar energy can all reduce poverty in developing countries.
[ Trong thế giới nơi mà 2 tỉ người sống trong những ngôi nhà không có bóng đèn dây tóc, công nghệ nắm giữ chìa khóa để xóa bỏ nghèo đói.]
Which of the following is NOT considered an essential characteristic of architecture according to the passage?
Salt in its solid state is not able to conduct electricity because ______.
The author mentions “fish” in the first paragraph because __________________.
According to the passage, which of the following was an obstacle to the development of the icebox?
The word "substitutes" in paragraph 1 is closest in meaning to ________________.
When compared with implements "flaked with a counter-clockwise rotation”, it can be inferred that "implements flaked with a clock-wise motion" are ______________.
Which of the following could best serve as the title of the passage?
According to the passage, Moore's icebox allowed him to _______________.
The word “handheld” in the passage is closest in meaning to “______”.
The word "congested" in paragraph 1 is closest in meaning to ________________.