选择题：Do scientists know how many cryptic species exist?

题目内容：

Do scientists know how many cryptic species exist?

A．Not yet.

B．Yes, they do.

C．They will know the answer in another one or two years.

D．They will never know the answer.

参考答案：

听力原文：W: Hello, Ultimate Computers. May I help you?M: Yes, this is Jack Kordell f

听力原文：W: Hello, Ultimate Computers. May I help you?M: Yes, this is Jack Kordell from Hunter's Office S

分类：习题答案题型：选择题

Section ADirections: In this section, you will hear 8 short conversations and 2 long conversations. A

分类：习题答案题型：选择题

What has brought about unbelievable advancement of the global economy in the latest 20 years?A．Top Am

分类：习题答案题型：选择题

What is the perfect setting for picking pockets according to the speaker?A．Clothing stores where peop

分类：习题答案题型：选择题

Adam Smith, a writer in the 1770s, was the first person to see the importance of the division of labo

分类：习题答案题型：选择题