正确答案: A

正确

题目：雪松之所以呈明显的塔形树冠，主要是由于顶端优势，即顶芽抑制侧芽的生长。( )

解析：A

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举一反三的答案和解析：

[单选题]I had great difficulty________the suitable food on the menu in that restaurant.

finding

解析：

have difficulty(in)doing sth.做某事有困难。

[单选题]CTens of thousands of theatre tickets will be given away to young people next year as part of a government campaign to inspire a lifelong love for theatre.

it would be a waste of money

[单选题]下列各组词语中加点的字，读音全都相同的一组是

嗜好 侍奉 试金石 适逢其会

[单选题]Who will write up a report on Mangrove Rivulus?

Scott Taylor

[单选题]____twice,thepostmanrefusedtodeliverourlettersunlesswechangedourdog.

Bitten

[单选题]木兰科、蓼科、十字花科和大戟科植物均为单叶。( )

错误