Which of the following is true about the DNA samples? A: Sample 2 had more restriction sites than the other samples. B: Sample 1 is the smallest DNA fragment. C: Samples 4 and 3 are the same DNA fragment. D: Samples 1 and 2 are the same DNA fragment.

Duplicate samples can also be called（） A: Counter samples B: sealed samples C: confirmed samples D: reference samples

Counter samples can also be called （ ）. A: duplicate samples B: sealed samples C: confirmed samples D: reference sample

Mr. Black is not very satisfied with the samples.

I cannot ________the difference of the two samples.

Which of the following are used to ask for materials? () A: Will you please send us your latest catalogue and price list? B: We shall appreciate your price lists and samples. C: We would be thankful if you could send your samples for our reference. D: Please send us your catalogue and price list.

We request you to furnish us ___ a full range ___ samples.

The steps for organizing field recordings data mainly include six steps: ① audio file encoding ② audio data conversion and processing ③ audio data import into computer ④ analysis of the physical features of recording samples ⑤ audio sample text sorting and content analysis ⑥ analysis of social and cultural significance of recording samples. The correct sequence of recording steps is: A: ①-②-③-④-⑤-⑥ B: ④-⑤-⑥-①-②-③ C: ③-②-①-④-⑤-⑥ D: ③-①-②-④-⑤-⑥

These samples are for you to choose _____.

Why does the man phone the woman（） A: To see if she has received the samples. B: To invite her to visit his company. C: To tell her he had sent her some samples. D: lb make an appointment with her.