题目内容

In the laboratory, DNA molecules can be cut at specific sequences using（）

A. UV light
B. restriction nucleases
C. DNA ligase
D. laser tweezers
E. DNA polymerase

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Which of the following may NOT be used in argumentative essays to convince readers（）

A. Statistics
B. Personal beliefs
C. Personal experiences
D. Logical reasoning

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Choose the best topic sentence for the following paragraph.______. For example, a person can have breakfast in New York, board an airplane, and have dinner in Paris. A businesswoman in London can inst

A. Technology has made people’s life more convenient
B. Advances in technology have made the world smaller
C. Technology has enriched people’s life
D. /

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Tick （√）the correct inforamtion about topic sentences. A topic sentence is（）

A. at or near the start of the paragraph
B. at the end of the paragraph
C. the main idea of the paragraph
D. the main idea of the whole essay
E. made up of fatual details
F. made up of a topic and the writer’s assertion

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Choose the appropriate conjunct to complete the sentence.Some of the studies show positive results,___ others do not（）

A. whereas
B. on the other hand
C. on the contrary
D. whenever

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In the laboratory, DNA molecules can be cut at specific sequences using（）

A. UV light B. restriction nucleases C. DNA ligase D. laser tweezers E. DNA polymerase

Which of the following may NOT be used in argumentative essays to convince readers（）

Choose the best topic sentence for the following paragraph.______. For example, a person can have breakfast in New York, board an airplane, and have dinner in Paris. A businesswoman in London can inst

Tick （√）the correct inforamtion about topic sentences. A topic sentence is（）

Choose the appropriate conjunct to complete the sentence.Some of the studies show positive results,___ others do not（）

A. UV light
B. restriction nucleases
C. DNA ligase
D. laser tweezers
E. DNA polymerase