单选题（题干缺失）

A、 Sending out more expeditions to locate mâle trees of this species.

B、 Creating more trees from the cuttings or pieces of this London tree.

C、 Looking for genetic variation in the existing 500 trees of this species.

D、 Trying to find a female tree of this species in order to create more trees.

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相关试题

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A、To add popular, movies to his movie channels.

B、To offer upgrades to his television service.

C、To lower the cost of his television service.

D、To do a survey about television service.

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A、She was unhappy

B、She was impolite.

C、She was decisive.

D、She was serious.

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A、She is an engineer.

B、She is a movie star.

C、She is a saleswoman.

D、She is a quality inspector.

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A、She made a rather strange noise wherever she went.

B、She looked at the prices of the tins of tea casually.

C、She insulted the owner by saying she was greedy.

D、She shook her head when looking at the prices

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A、She wanted to have them for free.

B、She wanted to pick out the best.

C、She wanted to have a discount.

D、She wanted to buy all of them.

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A、It has too few movie channels for his bill.

B、It charges extra money for extra service.

C、It shows a lot of movies per month.

D、It offers good and stable service.

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A、Free phone service.

B、Faster Internet speed.

C、One more television channel.

D、Two additional movie tickets.

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A、To quarrel with the shop owner.

B、

To negotiate the prices of the tea.

C、To conduct a survey of local tea prices.

D、To gain insight into cultural differences